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Macular Photocoagulation Study Group

Arch Ophthalmol. 1993;111(9):1189-1199.

Abstract
Objectives
To assess the visual prognosis of patients with age-related macular degeneration and unilateral extrafoveal choroidal neovascularization (CNV), and to determine the risk of CNV developing in fellow eyes that were initially unaffected.

Design, Patients, and Setting
Five-year prospective follow-up study of fellow eyes of 228 patients enrolled in a randomized clinical trial of laser photocoagulation of extrafoveal CNV. Visual acuity was measured and macular photographs were taken at 6-month intervals.

Main Outcome Measures
Five-year change in visual acuity of fellow eyes from baseline, incidence of legal blindness (visual acuity of 20/200 in the better eye), and cumulative incidence of CNV in fellow eyes free of neovascular maculopathy at the time of study enrollment.

Results
Photographically documented CNV developed in 33 (26%) of 128 fellow eyes that were initially free of neovascular maculopathy, and was associated with poor visual acuity at the end of the 5-year follow-up period. Among 67 patients who had bilateral neovascular maculopathy initially and were examined 5 years later, 33 (49%) were legally blind compared with 13 (12%) of 106 patients who had unilateral neovascular maculopathy initially. In all 13 of the latter group, CNV had developed in the fellow eye.

Conclusions
Patients with age-related macular degeneration and CNV in one eye are at high risk of legal blindness within 5 years, and, thus, should be followed up carefully to ensure that laser treatment can be applied to CNV in either eye whenever it is likely to improve the visual prognosis.

Author Affiliations
Prepared for the Macular Photocoagulation Study Group by Dean B. Burgess, MD; Barbara S. Hawkins, PhD; Joan L. Jefferys, ScM; Neil M. Bressler, MD; Susan B. Bressler, MD; Cheryl J. Hiner; Noreen B. Javornik, MS; David H. Orth, MD; and C. P. Wilkinson, MD.

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