We measured glare produced by opacified posterior capsules before and after neodymium-YAG laser posterior capsulotomy. In many eyes, particularly those with visual acuities of 20 200 or worse, glare threshold could not be determined. In 32 eyes with measurable preoperative glare, the median glare threshold improved from 45% to 12% and median visual acuity improved from 20 60 to 20 25. For 56 eyes the median postoperative glare threshold was also 12% and the median visual acuity improved from 20 80 to 20 25. Forty eyes achieved postoperative visual acuities of 20 25 or better, but in 16 eyes other ocular conditions limited visual acuity to 20 30 or worse. Glare and visual acuity were correlated preoperatively and usually improved concomitantly. One patient in whom wrinkles in a clear capsule produced streaks around bright lights had a glare threshold lower than other types of opacities. Capsulotomy improved the glare threshold and relieved the symptoms.
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