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Retinal Detachment Following YAG Laser Capsulotomy

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Retinal Detachment Following YAG Laser Capsulotomy Eye (1989) 3, 759-763 Retinal Detachment Following YAG Laser Capsulotomy C. 1. MacEWEN and P. S. BAINES Dundee Summary A retrospective study of 12 patients with rhegmatogenous retinal detachment follow­ ing YAG posterior capsulotomy is reported. Eleven out of these 12 were at increased risk of detachment. Three had lattice degeneration, three had previous detachment and five had axial myopia. Only 50% of the holes were typical "aphakic" post-oral breaks. Extra-capsular extraction, currently the tech­ 2% of patients.26 ,27 It has been suggested that nique of choice in cataract surgery, has the there may be a direct relationship between the main advantage over the previously preferred two events and that retinal detachments after intra-capsular method of facilitating intra­ YAG laser are distinct from other aphakic ocular lens implantation.1 In addition it is detachments, with most patients having pre­ associated with fewer posterior segment com­ disposing risk factors (myopia, lattice degen­ plications such as cystoid macular oedema2 eration or previous detachment).26 ,28 Other and retinal detachment.3 studies have indicated that they are indis­ An important disadvantage of extra-capsu­ tinguishable from other aphakic lar surgery is opacification of the posterior detachments.25,27,29 capsule, resulting in reduction of visual acuity We therefore carried out a retrospective in up to 50% of cases, depending on the length study of 12 patients who developed rheg­ of follow-up and the age of the patients matogenous retinal detachment following studied.4.9 At present posterior capsulotomy YAG capsulotomy to determine the charac­ can be carried out either by surgical discis­ teristics of these detachments and any pre­ sion6,7 or by photo-disruption using the neo­ disposing risk factors. dymium YAG laser.11J.17 Laser treatment has the advantage of being Patients and methods non-invasive11 and more cost effective18 than Patients who suffered retinal detachment fol­ conventional surgery. There have been, how­ lowing YAG capsulotomy were identified ever, a number of complications attributed to from the laser and theatre record books in this technique; increased intraocular pres­ Ninewells Hospital, Dundee and Gartnavel sure,IO,11,19-23 corneal endothelial damage ,19,24 Hospital, Glasgow. The following infor­ intraocular lens pitting,IO-13,17 uveitis,IO,11,13,14 mation was extracted from the case notes: cystoid macular oedema11,13,14 and retinal pre-operative refraction and axial length, detachment.11 ,13,14,15,26-29 Retinal detachment time between cataract extraction and YAG following YAG capsulotomy occurs in up to capsulotomy, time between capsulotomy and Correspondence to: Dr Paul S. Baines, FRCS, FCOphth, Department of Ophthalmology, Ninewells Hospital and Medical School, Dundee DD1 9SY. 760 C. J. MACEWEN AND P. S. BAINES diagnosis of retinal detachment, type and situ­ patients had small post-oral breaks and in the ation of the retinal hole and presence of risk remainder no definite hole was identified. factors for detachment formation. There were 12 patients who developed uni­ Time Intervals lateral rhegmatogenous retinal detachment The mean interval between cataract extrac­ following YAG capsulotomy. Four were male tion and YAG capsulotomy was 18.4 months and eight female, the average age was 57 years (range 6-24 months) and the time from cap­ old (range 33-77 years). Eight eyes were sulotomy to the diagnosis of detachment was pseudo-phakic and four were aphakic. 6.6 months (range 0.5-18 months). Results Discussion Predisposing Factors These results indicate that in our study patients who develop retinal detachment fol­ Eleven out of the 12 patients in this study had lowing YAG capsulotomy were at high risk a predisposition towards retinal detachment. and did not conform to the stereotyped pat­ Only one was not at increased risk (Table I). tern of "aphakic" detachment. Pre-operative refraction Cataract surgery of any type increases the chances of subsequent retinal detachment, The pre-operative refraction was known in 11 but maintenance of an intact posterior capsule out of the 12 cases. Two were emmetropic and helps to minimise this complication. 3,30 The nine were myopic, four requiring a correction rate of detachment after intra-capsular sur­ of six dioptres or more. gery is approximately 3.5%3,31 whereas it is much less ( 1 %) after uncomplicated extra­ Axial length capsular surgery30,32 and 2% following cap­ The axial length was known in nine cases, two sulotomy.26,27 Photo-disruption by the YAG of the remaining three were known to be laser may precipitate detachment by causing emmetropic. It was less than 25 mm in four vitreous liquification, direct retinal damage or cases and greater than 25 mm in the remaining setting up pressure wave transients. 25,27,29,33 five cases. There are certain conditions-myopia, lattice degeneration and previous retinal detach­ Retinal degeneration or previous detachment ment-which pre-dispose to the development Three eyes had lattice degeneration and three of detachment in all eyes, whether phakic or patients had suffered previous detachment in aphakic.34-36 Retinal detachment following the affected or fellow eye or in both eyes. YAG capsulotomy may therefore be a con­ sequence of: Retinal Holes (a) the cataract extraction itself. The retinal holes were equally distributed (b) the opening in the posterior capsule. over all four quadrants of the eye. There were (c) damage directly caused by the laser. six large operculated tears at the equator (d) any predisposing retinal lesion. occurring either in isolation or in association Regarding the first two possibilities, both with lattice or myopic degeneration. Three mechanical and biochemical factors have been implicated in the development of detachments following intra-capsular surgery. Table I Riskfactors present in patients who developed retinal detachment after YAG capsulotomy Herniation of the vitreous into the anterior chamber which leads to posterior vitreous Number detachment and increased mechanical trac­ Risk factor of patients tion on the vitreous base with subsequent reti­ Axial length >25 mm 5 nal hole formation is one postulated Lattice degeneration 3 mechanism regarding the aetiology of aphakic Previous retinal detachment 3 detachmentY Biochemically, the hyaluronic None 1 acid content of the vitreous in aphakic eyes Total 12 has been shown to be reduced compared with RETINAL DETACHMENT FOLLOWING YAG LASER CAPSULOTOMY 761 that of phakic eyes due to loss of the physical factors for the development of retinal detach­ barrier between the anterior and posterior ment. Myopia, lattice degeneration and pre­ segments.38 This may be responsible for an vious retinal detachment are all recognised as increased rate of vitreous liquifaction and syn­ increasing the chance of developing of retinal eresis with subsequent development of retinal detachment.34-36 In myopia it is, however, not tears. the refractive error, per se, which is impor­ However, the size of the YAG capsulotomy tant, but the axial length of the eye. Eyes with is relatively small. Also, the presence of an an axial length of 25 millimetres or more are at intra-ocular lens and peripheral capsule pre­ increased risk of developing retinal detach­ vent much forward movement of the vitreous ment after cataract extraction.42 Although and act as a barrier against biochemical previous studies regarding retinal detachment changes, making the above factors unlikely. after YAG capsulotomy have indicated that In addition, because the detachments occur the patients were at increased risk because of so soon after use of the YAG, some authors myopia,15,26,28 these were based on pre-opera­ suspect that the laser itself is responsible for tive refraction, which may include a degree of retinal hole formation. Direct damage to the index myopic changes associated with the lens retina by the laser has been reported, but only opacities. We included axial length measure­ when the beam is focused at a distance of two ments in this study in order to ensure that all to three millimetres from the retinal surface. 39 cases of index myopia were recognised and This is considerably closer than occurs during found that almost half of our patients had posterior capsulotomy. None of the retinal significant axial myopia. holes were accompanied by haemorrhage or Small post-oral breaks are typically found retinal pigment epithelial abnormalities as in aphakic retinal detachments, whereas large would be expected if they had been caused equatorial tears are more suggestive of myo­ directly by laser damage. Transient acoustic pic detachments.43 We found that 50% of our shock waves are set up at the formation and cases had tears which were not typically again at the collapse of the plasma.33 These "aphakic", but were not more likely to be have been shown to produce pressure effects associated with lattice or myopia which have which radiate quite a distance into the eye and equatorial pathology. The remaining holes may cause shearing forces on the peripheral were more typical of aphakic detachments retina.33 Rupture of the anterior hyaloid face (retinal holes often not being found in aphakic and damage to the vitreous directly behind the patients as they are small and very peripheral; posterior capsule occurs during capsulotomy25 these may be especially difficult to see in cases and this may predispose to retinal hole where there is an opaque posterior capsule). formation. Previous work has found that all, or most, of
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