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CASE REPORT
In 1984, a 57-year-old man was evaluated for chronic open-angle glaucoma. At that time, he had a 14-year history of insulin-dependent diabetes mellitus. Visual acuity was 20/80 RE, 20/50 LE; the applanation tension was 30 mm Hg in both eyes. Aside from moderate lenticular changes and asymmetrical disc cupping (left greater than right), the rest of the ocular examination was normal. There was no diabetic retinopathy at that time. Intraocular pressure (IOP) was controlled initially with topical dipivefrin and later with the addition of topical timolol maléate. In February 1985, when the IOP increased in the left eye, argon laser trabeculoplasty was performed over the nasal half of the trabecular meshwork, resulting in an applanation tension of 20 mm Hg.
By September 1988, advanced nonproliferative diabetic retinopathy was detected in both eyes. In November 1989, proliferative diabetic retinopathy was noted in both eyes. By February 15, 1990, panretinal photocoagulation had been completed in the right eye and just initiated in the left eye. At that time, the visual acuity in the left eye was 20/300 and the applanation tension was 25 mm Hg. No pupillary rubeosis could be detected in the left eye on slit-lamp examination.
On gonioscopy, angle neovascularization was noted throughout the nasal half of...