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M. C. van Bree, T. J. T. P. van den Berg, B. L. M. Zijlmans; Effect of Neodymium:Yag Laser Capsulotomy on Retinal Straylight Values in Patients With Posterior Capsule Opacification. Invest. Ophthalmol. Vis. Sci. 2009;50(13):1623.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the effect of Neodymium:Yag laser capsulotomy on retinal straylight values in patients with posterior capsule opacification (PCO).
This prospective observational study comprised 36 eyes of 36 PCO patients (average age 73 years), scheduled to undergo Nd:Yag capsulotomy. Before and after Nd:Yag capsulotomy best corrected visual acuity (BCVA) (ETDRS chart), contrast sensitivity (CS) (Pelli-Robson) and retinal straylight (C-Quant instrument) were measured. The dutch version of the 25-item National Eye Institute's Visual Function Questionnaire (VFQ) and a newly developed 4-item photographic glare questionnaire were completed. The results of the PCO patients were compared to those of age-matched pseudophakic subjects without PCO (36 eyes).
Before and after Nd:Yag capsulotomy, there was no significant correlation between the straylight parameter and BCVA (before capsulotomy r= .08, p> .05; after capsulotomy r= -.26, p> .05). The straylight parameter and CS showed a moderate correlation before capsulotomy (r= -.41, p< .05), but after capsulotomy there was no significant correlation (r= -.20, p> .05). BCVA, CS, straylight values and VFQ scores improved significantly after capsulotomy (mean improvements 0.20 log units, 0.18 log units, 0.11 log units and 63 points respectively, p-values < .0005). BCVA, CS, VFQ scores and glare scores in patients with a capsulotomy opening and control subjects did not significantly differ (p= .60 and p= .10 respectively). However, the mean level of intraocular straylight was higher in patients with a capsulotomy opening (1.19 log units) compared to control subjects (1.07 log units).
After capsulotomy BCVA, CS, straylight values and VFQ-scores significantly improved. No uniform relation between BCVA and retinal straylight exists. Straylight and BCVA must be considered as independent entry criteria for capsulotomy.
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