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Cyclodestruction and cyclophotocoagulation: Where are we?
Ciclodestrucción y ciclofotocoagulacion: ¿dónde estamos ahora?
B. Vidal-Villegasa, J.A. Miralles de Imperial-Ollerob,c,d,
Corresponding author
juanantonio.miralles@um.es

Corresponding authors.
, M.P. Villegas-Pérezb,c,d,e,
Corresponding author
mpville@um.es

Corresponding authors.
a St. Thomas’ Hospital, Guy’s and St Thomas’ Trust (GSTT), London, United Kingdom
b Hospital General Universitario Reina Sofía, Murcia, Spain
c Instituto Murciano de Investigación Biosanitaria (IMIB Virgen de la Arrixaca), El Palmar, Murcia, Spain
d Red de Enfermedades Inflamatorias (Redes de Investigación Cooperativa Orientadas a Resultados en Salud [RICORS])
e Departamento de Oftalmología, Facultad de Medicina, Universidad de Murcia, El Palmar, Murcia, Spain
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Application sites of YAG laser for cyclophotocoagulation of the ciliary body&#58; a&#41; 1&#160;mm or b&#41; 3&#160;mm away from the limbus&#46; C&#58; cornea&#59; I&#58; iris&#59; L&#58; lens&#59; RE&#58; right eye &#40;oculus dexter&#41;&#59; LE&#58; left eye &#40;oculus sinister&#41;&#59; R&#58; retina&#59; S&#58; sclera&#59; V&#58; vitreous&#46; Image reproduced with permission from Liu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a></p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Glaucomatous disease is the leading cause of irreversible blindness in industrialized countries&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> When diagnosing the disease&#44; the ophthalmologist must assess the patient&#8217;s characteristics and plan a personalized treatment to address the etiology of glaucoma or&#44; if that is not possible&#44; reduce intraocular pressure and thus prevent the progression of glaucomatous neuropathy&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Although there are several types of treatment for glaucomatous disease&#44; all carry risks and involve health care costs&#46; The therapeutic scale typically considers the following treatment steps&#44; in this order&#58; medical therapy&#44; laser trabeculoplasty&#44; minimally invasive and minimally penetrating surgical techniques&#44; filtering surgical techniques and&#47;or the implantation of drainage devices&#44; and cyclodestruction&#46;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4</span></a> Generally&#44; cycloablative techniques are applied in patients with refractory glaucoma&#44; meaning glaucomas that have already undergone surgery yet the intervention has not been able to control the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> However&#44; recent advances in the understanding and use of cycloablative techniques may result in a shift in the glaucoma treatment hierarchy&#44; which we will discuss below&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Cyclodestruction&#58; techniques</span><p id="par0015" class="elsevierStylePara elsevierViewall">Cyclodestruction is a technique proposed in the last century that aimed to destroy the epithelium of the ciliary body to reduce the production of aqueous humor&#46; The first procedure used for cyclodestruction was non-penetrating diathermy&#44; advocated by Weve in 1933&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> Afterwards&#44; Vogt used penetrating diathermy&#44;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> and although other authors used beta irradiation<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> and cycloelectrolysis&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> these techniques had many complications and were not widely adopted&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Cyclocryotherapy was first introduced by Bietti in 1950<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> and became the preferred method for cyclodestruction in the following years&#44;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;12</span></a> with reports documenting that it caused destruction of the epithelium and capillaries of the ciliary body&#44; damage to the structures of the chamber angle&#44; and rupture of the blood-aqueous barrier&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a> Due to the complications associated with cyclocryotherapy&#44; other techniques were explored&#46; In 1961&#44; Weekers et al&#46; described xenon arc lamp cyclophotocoagulation&#44;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> and in 1964&#44; ultrasound cyclodestruction was first reported&#44;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> later used by Coleman et al&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> However&#44; its use was also limited due to serious complications and high cost&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> Recently&#44; however&#44; a variation of ultrasound cyclodestruction has been introduced<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> using a specially developed device &#40;Eye OP1 Eyetech&#41; that performs a circular application with preset parameters&#44; and a few studies documenting good results with this technique have been published&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">17&#8211;19</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Continuing with the progression of cyclodestruction&#44; after ultrasound&#44; microwaves were tested&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> but their use did not become widespread&#46; However&#44; transscleral laser cyclophotocoagulation was developed and became a widely used cyclodestruction technique in the late 20th century&#46; Ruby and neodymium laser cyclophotocoagulation was proposed by Smith and Stein in 1969&#44;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> and the first reports on cyclophotocoagulation using these lasers came from Beckman et al&#46; in 1972<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> and Beckman and Sugar in 1973&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> Transpupillary argon laser cyclophotocoagulation was proposed just before&#44; in 1971&#44; by Lee and Pomertantzeff&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> The YAG laser was widely used for cyclodestruction for many years due to its effectiveness&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> Later&#44; the diode laser was introduced&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a> which was used transsclerally by Hennis and Stewart in 1992<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> and directly or endoscopically by Uram&#44; <a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a> also that same year&#46; Therefore&#44; since the 1970s&#44; many authors have performed cyclodestruction using cyclophotocoagulation with various lasers&#58; argon&#44; krypton&#44; YAG&#44; diode&#44; and 3 application routes&#58; transpupillary&#44; transscleral&#44; and direct or endoscopic&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Transpupillary cyclophotocoagulation &#40;TP-CPC&#41; is performed with an argon&#44; krypton&#44; frequency-doubled YAG laser &#40;continuous wave or pulsed&#41;&#44; or diode laser and a gonioscopy lens &#40;preferably with indentation&#41; that allows the laser beam to be directed toward the ciliary processes&#46; Since this technique requires visualization of the ciliary body&#44; its use has been limited to cases of aphakia&#44; aniridia&#44; or anterior iris displacement&#46;<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#8211;30</span></a> In Spain&#44; intraoperative transpupillary diode laser cyclophotocoagulation has been described using a gonioscopy lens and iris hooks&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">31</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">Endoscopic or direct cyclophotocoagulation &#40;E-CPC&#41; with a diode laser has been widely used and is performed on the ciliary processes with direct visualization of these structures&#46; However&#44; E-CPC requires opening the eye&#44; so it is done through the anterior route or the pars plana&#46; For this reason&#44; it is often combined with other surgical procedures&#44; such as cataract surgery&#44; and seems to have more complications and be less effective than transscleral cyclophotocoagulation&#44;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">18&#44;32&#44;33</span></a> though it has similar efficacy to other classic techniques like cyclocryotherapy&#44; trabeculectomy&#44; or drainage implants in treating refractory adult glaucoma&#44;<a class="elsevierStyleCrossRefs" href="#bib0170"><span class="elsevierStyleSup">34&#44;35</span></a> and slightly less efficacy in pediatric glaucoma&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> In 2016&#44; Tan introduced photocoagulation of the ciliary processes and the pars plana &#40;E-CPC-plus<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a>&#41;&#44; but it had more long-term complications&#46; The efficacy of E-CPC is debated for primary open-angle and angle-closure glaucoma&#46; In 2019&#44; a Cochrane review found no evidence that E-CPC is safe or effective in patients with primary open-angle or primary angle-closure glaucoma&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">37</span></a> A recent randomized study also found no evidence that it is superior to phacoemulsification alone in primary angle-closure glaucoma&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a> However&#44; P&#233;rez-Bartolom&#233; et al&#46; documented a beneficial effect of E-CPC in primary open-angle glaucoma&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> A 2024 meta-analysis compared isolated phacoemulsification with combined phacoemulsification and cyclophotocoagulation in glaucoma patients and found that the former had better visual acuity outcomes and fewer complications&#44; while the latter had better intraocular pressure outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">40</span></a> A randomized clinical trial &#40;the CONCEPT study&#41; is currently underway in the UK in patients undergoing cataract surgery to compare the efficacy of ECP along with phacoemulsification in patients with primary open-angle glaucoma to isolated phacoemulsification&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Transscleral cyclophotocoagulation technique has been the most widely used since it was first initiated in the mid-20th century and has been applied using non-contact &#40;slit-lamp application&#41; or contact &#40;application with fiber optic or probe&#41; methods&#46; As mentioned earlier&#44; ruby and neodymium-YAG lasers were first used for this technique&#44; and later&#44; <span class="elsevierStyleBold">diode laser</span>&#46; The latter ultimately prevailed due to its better absorption by the melanin in the ciliary epithelium&#44; as well as its effectiveness&#44; portability&#44; lower cost&#44; and longer duration&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Transscleral diode laser cyclophotocoagulation techniques with an 810&#160;nm diode laser</span><p id="par0045" class="elsevierStylePara elsevierViewall">Transscleral contact cyclophotocoagulation with an 810&#160;nm diode laser has been the classic cyclodestruction technique and the most widely used since the 1990s&#46; Although continuous wave transscleral contact cyclophotocoagulation with a diode laser &#40;CW-TSCPC&#41; has been performed for years&#44; recently&#44; to avoid the unpredictability and complications of CW-TSCPC&#44; micropulse transscleral contact cyclophotocoagulation &#40;MP-TSCPC&#41; has been introduced&#46;<a class="elsevierStyleCrossRefs" href="#bib0160"><span class="elsevierStyleSup">32&#44;43&#44;44</span></a> MP-TSCPC differs from CW-TSCPC in that&#44; while in continuous wave mode the laser energy is released for the entire time the laser is applied&#44; in micropulse mode&#44; the laser energy is released only part of the time that the laser is applied&#46; This period is known as the duty cycle&#46;<a class="elsevierStyleCrossRefs" href="#bib0160"><span class="elsevierStyleSup">32&#44;44</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">CW-TSCPC is applied using a G-probe &#40;Iridex&#44; Mountainview&#44; California&#44; United States&#41;&#44; designed so that the hole through which the laser is applied is 1&#46;2&#160;mm from the limbus&#44; with the laser beam being directed toward the ciliary processes&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">18&#44;26&#44;45</span></a> Calibration is performed by setting the laser power between 1500 and 2500&#160;mW at a duration of 2&#160;seconds &#40;3-4&#160;J&#41;&#44; applying the laser around the limbus&#46; If a &#8220;pop&#8221; sound is heard&#44; the power needs to be reduced by around 250&#160;mW&#44; as the sound indicates an explosion or vaporization of the tissue&#44; which can lead to possible complications&#46;<a class="elsevierStyleCrossRefs" href="#bib0230"><span class="elsevierStyleSup">46&#44;47</span></a> A total of 18 to 30 impacts are applied with this technique&#44; about 6-7 per quadrant&#44; avoiding the 3 and 9 o&#8217;clock meridians to prevent damage to the long ciliary nerves and arteries&#46; Given that 1&#160;Watt&#47;s&#160;&#61;&#160;1&#160;J&#44; each impact at 2000&#160;mW for 2&#160;seconds delivers 4&#160;J per impact&#44; resulting in a total of 60 to 120&#160;J applied in the procedure&#46;<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">48&#44;49</span></a> However&#44; some authors have used higher powers and&#47;or a greater number of applications&#44; suggesting that efficacy increases with higher energy doses&#44;<a class="elsevierStyleCrossRefs" href="#bib0250"><span class="elsevierStyleSup">50&#44;51</span></a> with up to 190&#160;J proposed&#46; However&#44; a study comparing the effectiveness of different energy levels concluded that the most effective energy is 135&#160;J&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">52</span></a> There is also a variation of CW-TSCPC called &#8220;slow coagulation&#44;&#8221; where the power is cut to 1250-1500&#160;mW and exposure time increased up to 3-5&#160;seconds&#46; This &#8220;slow&#8221; variety has been documented to have comparable hypotensive efficacy to the standard technique&#46;<a class="elsevierStyleCrossRefs" href="#bib0265"><span class="elsevierStyleSup">53&#44;54</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">MP-TSCPC is applied 3&#160;mm from the limbus with a probe called MP3&#44; designed for this purpose &#40;Iridex&#44; Mountainview&#44; California&#44; United States&#41;&#46; The power cannot be calibrated by sound as in CW-TSCPC&#44; and typically a power of 1500 to 2500&#160;mW is chosen&#44; with the laser being applied for 90-180&#160;seconds&#44;<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">43&#44;48&#44;49&#44;51</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">55&#44;56</span></a> although up to 360&#160;seconds has been used&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">44&#44;57&#8211;61</span></a> It has been proposed that the duty cycle for this technique should be set to 31&#46;3&#37;&#44; meaning the laser is &#8220;on&#8221; for 0&#46;5&#160;ms and &#8220;off&#8221; for 1&#46;1&#160;ms&#46; Another difference with the previous method is that the laser is applied by keeping the probe perpendicular to the sclera&#44; applying slight pressure&#44; and moving it in a continuous sweeping motion &#40;dynamic application&#41;&#44; again avoiding the 3 and 9 o&#8217;clock meridians&#46; The speed of this movement is important because it determines the fluence&#44; or the energy that reaches each point&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">62</span></a> Recently&#44; 2500&#160;mW&#44; 4 sweeps of 20&#160;seconds per hemisphere are recommended&#46;<a class="elsevierStyleCrossRefs" href="#bib0310"><span class="elsevierStyleSup">62&#44;63</span></a> However&#44; some authors using MP-TSCPC do not perform dynamic application&#44; opting instead for static application&#58; 2000&#160;mW for 10&#160;seconds at each application point&#44; up to a total of 120-360&#160;seconds&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> Due to variability in laser application times in different studies using MP-TSCPC&#44; the total energy applied has varied significantly&#44; ranging from 60 up to 225&#160;J&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">44&#44;60&#44;64</span></a> A review study suggests that around 150&#160;J is necessary for success<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a>&#46; However&#44; MP-TSCPC is a technique that also yields variable results depending on at least two other factors&#58; preoperative intraocular pressure and the type of glaucoma&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">18&#44;55</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Recently&#44; several groups have proposed mixed&#44; augmented&#44; or plus techniques&#44; as it was observed that the success of MP-TSCPC varied depending on the etiology of glaucoma&#46; Specifically&#44; it was more effective in primary open-angle glaucoma and less so in neovascular&#44; uveitic&#44; or post-keratoplasty glaucomas&#46;<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">43&#44;61&#44;65</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">Loayza-Gamboa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">66</span></a> have proposed combining the 2 techniques of transscleral contact cyclophotocoagulation with diode laser in what they have termed &#8220;Ciclo-Mix&#46;&#8221; In the superior hemifield&#44; the micropulse technique is applied for 80-150 seconds with movement&#44; while in the inferior hemifield&#44; the continuous wave technique is applied at 9 locationsusing a power of 1000&#160;mW for 2&#160;seconds &#40;reducing power if &#8220;pops&#8221; are heard&#41;&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Other authors have proposed the &#8220;augmented&#8221; micropulse transscleral cyclophotocoagulation technique&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">67</span></a> In this technique&#44; a micropulse cyclophotocoagulation is performed with movement&#44; followed by static application&#58; the laser is first applied at 2000-2400&#160;mW with a 31&#46;3&#37; duty cycle for 90&#160;seconds per hemisphere using movement&#44; then statically at 9 locations per hemisphere for 10 seconds&#46; The authors report that the &#8220;augmented&#8221; technique is more effective than the classic approach in the long term&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">67</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">Some authors combine augmented micropulse cyclophotocoagulation with continuous wave cyclophotocoagulation&#46;<a class="elsevierStyleCrossRef" href="#bib0340"><span class="elsevierStyleSup">68</span></a> They first perform the &#8220;augmented&#8221; cyclophotocoagulation proposed by Nirappel et al&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">67</span></a> and then apply continuous wave cyclophotocoagulation &#40;950 up to 2300&#160;mW&#44; depending on the &#8220;pop&#8221; sound&#41; for 3-4&#160;seconds at 3-5 locations per hemisphere &#40;depending on intraocular pressure and available conjunctival area&#41;&#46; These authors document that this technique is safe and effective in refractory glaucomas&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">A different group has proposed a modified micropulse transscleral cyclophotocoagulation technique called MP3 PLUS for patients with refractory glaucoma or those who have not responded to classic MP-TSCPC&#46;<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">65</span></a> In this technique&#44; the laser is applied 3&#160;mm from the limbus &#40;with 2000&#160;mW power and a 31&#46;3&#37; duty cycle&#41; with movement for 100&#160;seconds&#44; then the duty cycle is increased up to 40&#46;5&#37; &#40;0&#46;75&#160;ms &#8220;on&#8221; and 1&#46;1&#160;ms &#8220;off&#8221;&#41; plus 12 to 16 static applications &#40;of 1500-2000&#160;mW&#44; depending on the &#8220;pop&#8221; sounds&#44; for 2&#160;seconds&#41; in both hemispheres&#46; These authors also document the technique safety and efficacy profile&#46; Finally&#44; other authors use double sessions of MP-TSCPC&#44;<a class="elsevierStyleCrossRefs" href="#bib0345"><span class="elsevierStyleSup">69&#44;70</span></a> performing 2 successive treatments of 2000&#160;mW for 80&#160;seconds in each hemifield&#44; alternating between hemifields to allow cooling time between treatments&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">In all the former studies&#44; peribulbar or retrobulbar anesthesia was used prior to transscleral cyclophotocoagulation with diode laser&#46; Since MP-TSCPC is of shorter duration&#44; minimally invasive&#44; and its indications are expanding&#44; other anesthesia methods have been tested&#44; such as subconjunctival<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">71</span></a> and IV analgesia&#47;sedation combined with topical anesthesia&#46;<a class="elsevierStyleCrossRefs" href="#bib0345"><span class="elsevierStyleSup">69&#44;72</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Mechanism of action of transscleral contact cyclophotocoagulation techniques</span><p id="par0090" class="elsevierStylePara elsevierViewall">Transscleral photocoagulation techniques using continuous wave and micropulse differ in both the laser application distance and the method&#44; which is either static or dynamic&#46; In CW-TSCPC&#44; the laser is applied at 1&#46;2&#160;mm from the limbus&#44; whereas in MP-TSCPC&#44; the laser is applied 3&#160;mm away from the limbus&#46; But why have different distances and techniques been used&#63;</p><p id="par0095" class="elsevierStylePara elsevierViewall">Some authors have compared transscleral cyclophotocoagulation to &#8220;duck hunting in the dark without a radar&#8221; because the hunter cannot see either the target or the effect of the shot&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">73</span></a> When transscleral cyclophotocoagulation was first used&#44; the aim was to destroy the ciliary processes to reduce the production of aqueous humor&#46; Many anatomical and clinical studies have documented that the length of the ciliary body is between 5&#160;mm and 6&#160;mm &#40;and is correlated with axial length&#41;&#44; and that the pars plicata of the ciliary body is 1-2&#160;mm from the surgical limbus&#46; Specifically&#44; the ciliary processes are normally located 1-1&#46;5&#160;mm away from the limbus &#40;1&#46;5&#160;mm in the superior and inferior quadrants and 1&#160;mm away from the limbus in the nasal and temporal quadrants<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">48&#44;73&#8211;77</span></a>&#41;&#46; Therefore&#44; in early cyclophotocoagulation studies&#44; the laser was applied 1-1&#46;5&#160;mm away from the limbus to destroy the ciliary processes&#44; as it was documented that if the laser was applied at a distance of 2&#160;mm or more&#44; it would damage the pars plana&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">74</span></a> which was not the goal of the technique&#46; To correctly apply the laser light and focus it on the ciliary processes&#44; a laser application probe&#44; the &#8220;G-Probe&#174;&#8221; &#40;Iridex&#44; Mountain View&#44; California&#44; United States&#41;&#44; was designed with an asymmetrical shape that&#44; when aligned with the scleral-corneal limbus&#44; applies the laser 1&#46;2&#160;mm away from the limbus&#44; directly targeting the ciliary processes&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">Several studies have evaluated the effects of CW-TSCPC applied with the G probe 1&#46;2&#160;mm away from the limbus on the ciliary body&#46; Schuman et al&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">78</span></a> documented that diode laser produced ciliary process destruction in rabbits&#44; and Brancato et al&#46;<a class="elsevierStyleCrossRefs" href="#bib0395"><span class="elsevierStyleSup">79&#44;80</span></a> documented in an enucleated eye and in rabbits that the diode laser produced more extensive lesions than the YAG laser&#44; causing destruction of the ciliary processes&#44; intravascular coagulation&#44; and&#44; over time&#44; fibrosis and atrophy&#46; Pantcheva et al&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">81</span></a> also observed ciliary process and muscle destruction in pig eyes&#46; Francis et al&#46;<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">82</span></a> documented that CW-TSCPC with YAG laser caused destruction of the ciliary processes and their vessels in both primates and humans&#46; Feldman et al&#46;<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">83</span></a> showed ciliary process destruction in a deceased patient&#46; McKelvie and Walland<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">84</span></a> documented in 9 eyes requiring enucleation that all had damage to the pars plicata of the ciliary body&#44; and in two-thirds of the cases&#44; damage to the pars plana as well&#44; although not all application sites showed damage to the pars plicata&#46; Pantcheva et al&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">85</span></a> also documented in cadaver eyes that diode transscleral laser application produced destruction of the ciliary processes and their vascularization&#44; and occasionally&#44; the ciliary muscles&#44; with this destruction being more extensive than that observed with E-CPC&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">However&#44; some authors applied CW-TSCPC at other distances from the limbus and documented a decrease in intraocular pressure&#46; Beckman documented a reduction in intraocular pressure in refractory glaucoma by applying a ruby laser 3-6&#160;mm away from the limbus&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> Schubert noticed that when cryotherapy was performed on retinal lesions predisposing to retinal detachment&#44; intraocular pressure decreased<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">86</span></a> and documented that the application of YAG transscleral laser &#40;contact and non-contact&#41; 3&#160;mm away from the limbus in cadaver eyes increased aqueous humor outflow&#46;<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">87</span></a> Klapper et al&#46;<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">75</span></a> applied non-contact YAG transscleral laser 2 or 3&#160;mm away from the limbus and documented that the hypotensive effect was greater in patients where the laser was applied at 3&#160;mm&#46; These studies demonstrated that it was not necessary to destroy the ciliary processes to reduce intraocular pressure with cyclophotocoagulation&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">An important study in this field was conducted by Liu et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a> who documented in primates using contact CW-TSCPC with YAG laser 1 or 3&#160;mm away from the limbus that the 3&#160;mm application was more effective for long-term intraocular pressure reduction at a 6-month follow-up&#46; These authors also documented the types of lesions that occurred&#58; applications 1&#160;mm away from the limbus caused coagulation and necrosis of the ciliary processes&#44; while applications 3&#160;mm away caused coagulation and necrosis&#44; vitreous inflammation&#44; stromal edema&#44; and separation of the ciliary muscles from the sclera with opening of the supraciliary space&#46; Therefore&#44; these authors concluded that the anterior lesions resulted from ciliary process destruction&#44; while the posterior lesions increased uveoscleral outflow<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a><a class="elsevierStyleCrossRef" href="#fig0005">&#40;Fig&#46; 1&#41;</a>&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0115" class="elsevierStylePara elsevierViewall">A study evaluated the effects of MP-TSCPC on enucleated primate eyes and documented that it caused contraction of the longitudinal ciliary muscle&#44; posterior displacement of the scleral spur&#44; and enlargement of Schlemm&#8217;s canal&#44; comparing the technique to the action of pilocarpine&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">88</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">Various authors have studied the effects of CW-TSCPC and MP-TSCPC on cadaver eyes&#46;<a class="elsevierStyleCrossRefs" href="#bib0445"><span class="elsevierStyleSup">89&#8211;91</span></a> These studies compared continuous wave cyclophotocoagulation with micropulse cyclophotocoagulation&#46; Maslin et al&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">90</span></a> observed that MP-TSCPC caused minimal changes in the ciliary body vs CW-TSCPC&#46; Moussa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">91</span></a> documented that&#44; interestingly&#44; although the laser was applied with probes designed to target 1&#46;2 or 3&#160;mm away from the limbus&#44; in both techniques&#44; macro and microscopic lesions were found in the pars plana&#46; Also&#44; that CW-TSCPC lesions were circular&#44; while the MP-TSCPC ones were linear&#46; They also documented that only CW-TSCPC caused destruction of the ciliary epithelium &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#44; while both techniques damaged the stroma&#44; leading to the conclusion that MP-TSCPC must reduce intraocular pressure through mechanisms other than reducing aqueous humor production&#46; Williams et al&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">89</span></a> documented that CW-TSCPC caused necrosis of the ciliary epithelium and muscle&#44; while MP-TSCPC caused fibrosis of the ciliary body&#46; An increase in choroidal thickness after MP-TSCPC has also been documented&#44; which has been interpreted as a sign of increased uveoscleral flow&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">92</span></a> Thus&#44; it has been shown that MP-TSCPC causes much less tissue destruction than CW-TSCPC&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Safety and efficacy profile of contact transscleral cyclophotocoagulation techniques with diode laser</span><p id="par0125" class="elsevierStylePara elsevierViewall">Several studies have analyzed the safety and efficacy profil eof the 2 techniques of transscleral cyclophotocoagulation with diode laser&#46; However&#44; they should be interpreted with caution&#44; as these studies have used different inclusion criteria&#44; different races&#44; different types of glaucoma&#44; different laser application techniques&#44; different intraocular pressure &#40;IOP&#41; levels and&#47;or prior surgical treatments&#44; and different success criteria&#46; As a result&#44; they show very variable outcomes&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">A reduction in IOP&#160;&#62;&#160;20&#37; has been documented in 40&#37; up to 90&#37; of patients treated with CW-TSCPC and in 30&#37; up to 50&#37; of those treated with MP-TSCPC&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;10&#44;18&#44;34</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">48&#44;55&#44;63&#44;93&#8211;100</span></a> This reduction is related to the type of glaucoma&#44; as it is less effective in neovascular glaucoma&#44; and also to the pre-treatment IOP level&#44; with lower effectiveness observed in patients with higher pressures&#46; Both CW-TSCPC and MP-TSCPC have been shown to reduce the need for ocular hypotensive drugs&#44; with similar results for both techniques&#46; Although retreatment rates have varied between studies&#44; they tend to be lower in MP-TSCPC&#46; However&#44; studies document more complications in patients treated with CW-TSCPC&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;10&#44;18&#44;34</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">48&#44;51&#44;55&#44;63</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRefs" href="#bib0465"><span class="elsevierStyleSup">93&#44;95&#8211;102</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">The most common complications of both techniques include decreased visual acuity&#44; inflammation&#44; hypotony that can lead to phthisis&#44; and macular edema&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;18&#44;34&#44;55</span></a> In general&#44; these complications tend to be more common with CW-TSCPC&#44; except for inflammation&#44; which is similar between the 2 techniques&#46; Although the most feared complication is phthisis bulbi&#44; which had not been previously described in MP-TSCPC&#44; recent studies have shown that it can also occur after this treatment&#46;<a class="elsevierStyleCrossRefs" href="#bib0095"><span class="elsevierStyleSup">19&#44;101</span></a> This complication is more frequent in refractory glaucomas&#44; such as neovascular glaucoma&#46;<a class="elsevierStyleCrossRefs" href="#bib0095"><span class="elsevierStyleSup">19&#44;101</span></a> Many other less common complications have been described with both techniques&#44; including conjunctival burns and hemorrhages&#44; scleral thinning&#44;<a class="elsevierStyleCrossRef" href="#bib0515"><span class="elsevierStyleSup">103</span></a> scleral perforation&#44;<a class="elsevierStyleCrossRef" href="#bib0520"><span class="elsevierStyleSup">104</span></a> malignant glaucoma&#44;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> anterior uveitis&#44; intermediate uveitis&#44;<a class="elsevierStyleCrossRef" href="#bib0525"><span class="elsevierStyleSup">105</span></a> hyphema&#44; vitreous hemorrhage&#44;<a class="elsevierStyleCrossRefs" href="#bib0530"><span class="elsevierStyleSup">106&#44;107</span></a> suprachoroidal hemorrhage&#44;<a class="elsevierStyleCrossRef" href="#bib0535"><span class="elsevierStyleSup">107</span></a> proliferative retinopathy&#44;<a class="elsevierStyleCrossRef" href="#bib0540"><span class="elsevierStyleSup">108</span></a> neurotrophic keratopathy&#44;<a class="elsevierStyleCrossRef" href="#bib0545"><span class="elsevierStyleSup">109</span></a> corneal edema&#44; atonic pupil&#44;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;7&#44;94</span></a> displacement of intraocular ICL lens&#44;<a class="elsevierStyleCrossRef" href="#bib0550"><span class="elsevierStyleSup">110</span></a> iris injury&#44;<a class="elsevierStyleCrossRef" href="#bib0515"><span class="elsevierStyleSup">103</span></a> and sympathetic ophthalmia&#46;<a class="elsevierStyleCrossRef" href="#bib0555"><span class="elsevierStyleSup">111</span></a></p><p id="par0140" class="elsevierStylePara elsevierViewall">Although both diode laser transscleral photocoagulation techniques&#44; CW-TSCPC and MP-TSCPC&#44; are used in several countries&#44; their indications and application techniques vary greatly among different authors&#46; The MP-TSCPC technique is used in almost all countries except for the United Kingdom&#44; where in 2021&#44; the NICE published a set of guidelines stating that the effectiveness of this technique was not proven&#44; recommending its use only for research purposes&#46; However&#44; a recent study from the same country&#44; which compared the effectiveness of CW-TSCPC with MP-TSCPC &#40;including patients treated with micropulse before the 2021 guidelines were published&#41;&#44; concluded that the technique is effective&#44; though perhaps not as much as CW-TSCPC&#44; and that it has fewer complications&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Other authors&#44; such as Quigley in the United States&#44; also believe that many aspects of the mode of action&#44; application method&#44; effectiveness&#44; or safety of MP-TSCPC are not sufficiently documented&#46;<a class="elsevierStyleCrossRef" href="#bib0560"><span class="elsevierStyleSup">112</span></a> He argues that there is currently no evidence supporting the site of application&#44; the application method with movement&#44; the 31&#46;3&#37; duty cycle used&#44; or its mechanism of action&#46; He also notes that randomized studies comparing the 2 diode laser TS-CPC techniques have not been conducted&#44; and that the superiority of MP-TSCPC over CW-TSCPC has not been demonstrated&#44; also reminding that both techniques have adverse effects&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Recently&#44; systematic reviews have been conducted to compare CW-TSCPC with MP-TSCPC&#46;<a class="elsevierStyleCrossRefs" href="#bib0565"><span class="elsevierStyleSup">113&#44;114</span></a> The meta-analysis conducted by Ling et al&#46;<a class="elsevierStyleCrossRef" href="#bib0565"><span class="elsevierStyleSup">113</span></a> analyzed six clinical studies&#44; two of which were randomized&#44; and documented that both techniques showed comparable results in lowering intraocular pressure &#40;although long-term results were better with CW-TSCPC&#41;&#44; that MP-TSCPC reduced the number of ocular hypotensive medications less and had lower retreatment rates than CW-TSCPC&#44; but that CW-TSCPC was associated with a greater decrease in visual acuity&#46; These authors concluded that MP-TSCPC was effective in reducing IOP for&#44; at least&#44; 12 months and had a better safety profile than CW-TSCPC&#46;<a class="elsevierStyleCrossRef" href="#bib0565"><span class="elsevierStyleSup">113</span></a> The review by Johansyah and Bambang<a class="elsevierStyleCrossRef" href="#bib0570"><span class="elsevierStyleSup">114</span></a> also included six clinical studies&#44; two of them randomized&#44; and documented that both techniques had comparable results in terms of intraocular pressure reduction&#44; with fewer complications in MP-TSCPC&#46; This study also concluded that&#44; although MP-TSCPC has good outcomes&#44; these are not sufficiently documented in pediatric glaucoma or neovascular glaucoma&#44; and more studies are needed to clarify its indications and application technique&#46;<a class="elsevierStyleCrossRef" href="#bib0570"><span class="elsevierStyleSup">114</span></a></p><p id="par0155" class="elsevierStylePara elsevierViewall">A meta-analysis comparing CW-TSCPC with cyclocryotherapy has also been conducted&#46;<a class="elsevierStyleCrossRef" href="#bib0575"><span class="elsevierStyleSup">115</span></a> Cyclocryotherapy is assumed to be abandoned due to its complications&#59; however&#44; this review found no differences in terms of intraocular pressure reduction&#44; the number of ocular hypotensive medications&#44; retreatment rates&#44; or complications between the two techniques&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Cyclophotocoagulation and the therapeutic algorithm in glaucoma</span><p id="par0160" class="elsevierStylePara elsevierViewall">The current role of cyclodestructive techniques&#8212;cyclocryotherapy&#44; cyclophotocoagulation&#44; and ultrasound-based cyclodestruction&#8212;in the therapeutic algorithm for glaucoma is debatable&#46; These techniques were long reserved for patients with refractory glaucoma&#44; which had not responded to previous surgical treatments&#44;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4&#44;93</span></a> but the definition of refractory glaucoma varies depending on the authors&#44; with some including glaucomas that do not respond to medical treatments&#46; Additionally&#44; recent studies have documented that diode laser TS-CPC is a safe and effective technique&#44; especially when using MP-TSCPC&#44; and some authors now place it on the third therapeutic tier&#44; following medical treatment and laser trabeculoplasty&#46;</p><p id="par0165" class="elsevierStylePara elsevierViewall">Egbert et al&#46;<a class="elsevierStyleCrossRef" href="#bib0580"><span class="elsevierStyleSup">116</span></a> used CW-TSCPC with a diode laser as the first-line therapy in patients with primary open-angle glaucoma in Ghana and documented a reduction in intraocular pressure with few complications&#44; although an atonic pupil occurred in 28&#37; of eyes&#44; an adverse effect not previously documented&#46; In 2018&#44; this was the only clinical study that had applied CW-TSCPC as the primary and sole treatment in patients with glaucoma&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> However&#44; many studies have used diode laser TS-CPC in patients with both refractory and non-refractory glaucomas &#40;those not controlled by surgical or medical treatment&#41;&#46; Notable examples include those by Ansari and Gandhewar<a class="elsevierStyleCrossRef" href="#bib0585"><span class="elsevierStyleSup">117</span></a> and Sari et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0495"><span class="elsevierStyleSup">99</span></a> who used CW-TSCPC with a diode laser&#44; and those by Garc&#237;a et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0590"><span class="elsevierStyleSup">118</span></a> Emanuel et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">57</span></a> S&#225;nchez et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">58</span></a> Williams et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> Yelenskiy et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">61</span></a> de Crom et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0595"><span class="elsevierStyleSup">119</span></a> Vig et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">56</span></a> Lim et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0505"><span class="elsevierStyleSup">101</span></a> Tekeli and Kose&#44;<a class="elsevierStyleCrossRef" href="#bib0600"><span class="elsevierStyleSup">120</span></a> Bolek et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> and Checo et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0605"><span class="elsevierStyleSup">121</span></a> who used MP-TSCPC with a diode laser in various types of glaucoma&#44; with good results&#44; although Lee et al&#46;<a class="elsevierStyleCrossRef" href="#bib0610"><span class="elsevierStyleSup">122</span></a> report a much lower success rate in pediatric glaucoma of various etiologies&#46; Abdullatif and El-Saied<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">49</span></a> used high-intensity ultrasound&#44; CW-TSCPC&#44; and MP-TSCPC in patients with primary open-angle glaucoma and documented a similar response with all three treatments&#46; Toyos and Toyos<a class="elsevierStyleCrossRef" href="#bib0615"><span class="elsevierStyleSup">123</span></a> and Basto et al&#46;<a class="elsevierStyleCrossRef" href="#bib0620"><span class="elsevierStyleSup">124</span></a> also reported good results with MP-TSCPC in patients with primary open-angle glaucoma&#44; Chauhan et al&#46;<a class="elsevierStyleCrossRef" href="#bib0625"><span class="elsevierStyleSup">125</span></a> and Raja et al&#46;<a class="elsevierStyleCrossRef" href="#bib0630"><span class="elsevierStyleSup">126</span></a> in patients with primary angle-closure glaucoma&#44; Abdelrahman and Ismail<a class="elsevierStyleCrossRef" href="#bib0635"><span class="elsevierStyleSup">127</span></a> in angle-closure due to nanophthalmos&#44; and Khodeiry et al&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">102</span></a> in post-keratoplasty glaucoma&#46; Murtaza et al&#46;<a class="elsevierStyleCrossRef" href="#bib0640"><span class="elsevierStyleSup">128</span></a> used MP-TSCPC in patients with glaucoma or ocular hypertension who had not undergone previous glaucoma surgery&#44; also with good results&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Conclusions</span><p id="par0170" class="elsevierStylePara elsevierViewall">Current transscleral cyclophotocoagulation techniques with diode laser are effective methods&#46; Although MP-TSCPC might be somewhat less effective than CW-TSCPC in lowering intraocular pressure it also has fewer complications&#46; Since these techniques are minimally invasive&#44; short in duration&#44; effective&#44; and safe&#44; their indications are expanding&#44; especially for MP-TSCPC&#44; which is now being considered by some authors as the first-line therapu for glaucoma and&#47;or ocular hypertension&#46; Of note&#44; however&#44; that both techniques can have serious complications that may persist and&#47;or develop over time&#44; so they should be used with caution&#46; Additionally&#44; further studies are needed on MP-TSCPC to clarify its mechanism of action&#44; method of application&#44; treatment parameters&#44; the patients who benefit most&#44; and how it compares with CW-TSCPC&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Funding</span><p id="par0175" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Conflicts of interest</span><p id="par0180" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "identificador" => "sec0010"
          "titulo" => "Cyclodestruction&#58; techniques"
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        6 => array:2 [
          "identificador" => "sec0015"
          "titulo" => "Transscleral diode laser cyclophotocoagulation techniques with an 810&#160;nm diode laser"
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        7 => array:2 [
          "identificador" => "sec0020"
          "titulo" => "Mechanism of action of transscleral contact cyclophotocoagulation techniques"
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        8 => array:2 [
          "identificador" => "sec0025"
          "titulo" => "Safety and efficacy profile of contact transscleral cyclophotocoagulation techniques with diode laser"
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          "identificador" => "sec0030"
          "titulo" => "Cyclophotocoagulation and the therapeutic algorithm in glaucoma"
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        10 => array:2 [
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          "titulo" => "Conclusions"
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            1 => "Cyclodestruction"
            2 => "Cyclophotocoagulation"
            3 => "Transcleral"
            4 => "Diode laser"
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            0 => "Glaucoma"
            1 => "Ciclodestrucci&#243;n"
            2 => "Ciclofotocoagulaci&#243;n"
            3 => "Transescleral"
            4 => "L&#225;ser de diodo"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Cyclodestruction is a technique reserved for glaucomas not controlled with medical and surgical treatment and poor visual potential&#46; During the last century&#44; new cyclodestructive techniques were developed&#44; including cyclophotocoagulation&#44; and the use of continuous-wave diode laser transescleral cyclophotocoagulation &#40;CW-TS-CPC&#41; has become widespread&#46; In recent decades&#44; micropulse diode laser transescleral cyclophotocoagulation &#40;MP-TS-CPC&#41; was introduced&#46; We review the cyclodestruction techniques since their origins and these two techniques of cyclophotocoagulation&#44; which are currently the most widely used&#58; how they are performed&#44; their mechanisms of action and their effectiveness and efficacy&#46; We also review the comparison between them and with other techniques&#46;</p></span>"
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">La ciclodestrucci&#243;n es una t&#233;cnica que se reservaba para glaucomas que no se controlaban con tratamiento m&#233;dico y quir&#250;rgico y que ten&#237;an un escaso potencial visual&#46; Durante el siglo pasado se fueron desarrollando las t&#233;cnicas de ciclodestrucci&#243;n&#44; entre ellas la ciclofotocoagulaci&#243;n y se generaliz&#243; el uso de la ciclofotocoagulaci&#243;n transescleral de contacto con onda continua de l&#225;ser de diodo &#40;CW-TS-CPC&#41;&#46; En las &#250;ltimas d&#233;cadas se ha introducido la ciclofotocoagulaci&#243;n transescleral de contacto con micropulsos de l&#225;ser de diodo &#40;MP-TS-CPC&#41;&#46; Revisamos las t&#233;cnicas de ciclodestrucci&#243;n desde sus inicios y estas 2 t&#233;cnicas de ciclofotocoagulaci&#243;n con l&#225;ser de diodo que son las m&#225;s utilizadas en la actualidad&#58; c&#243;mo se realizan&#44; sus mecanismos de actuaci&#243;n y su efectividad y eficacia&#46; Adem&#225;s&#44; revisamos la comparaci&#243;n entre ambas y con otras t&#233;cnicas&#46;</p></span>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Application sites of YAG laser for cyclophotocoagulation of the ciliary body&#58; a&#41; 1&#160;mm or b&#41; 3&#160;mm away from the limbus&#46; C&#58; cornea&#59; I&#58; iris&#59; L&#58; lens&#59; RE&#58; right eye &#40;oculus dexter&#41;&#59; LE&#58; left eye &#40;oculus sinister&#41;&#59; R&#58; retina&#59; S&#58; sclera&#59; V&#58; vitreous&#46; Image reproduced with permission from Liu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">76</span></a></p>"
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