HIGH-RISK CHARACTERISTICS OF FELLOW EYES OF PATIENTS WITH UNILATERAL NEOVASCULAR AGE-RELATED MACULAR DEGENERATION

Objective: This study aimed to determine whether clinical tests of ocu lar function and macular appearance independently can help to predict which patients with unilateral neovascular age-related macular degener ation (AMD) will have a choroidal neovascular membrane (CNVM) develop in their fellow eye. Design: The study design was a prospective cohort study. Participants: One hundred twenty-seven patients with unilatera l neovascular AMD observed for up to 4.5 years participated. Intervent ion: Functional measurements included visual acuity, macular visual fi eld, glare recovery time, and foveal electroretinogram amplitude and i mplicit time. Main Outcome Measure: The age-adjusted proportion of pat ients having a CNVM develop over follow-up assessed by the Cox proport ional hazards model with stepwise selection was measured, Results: On average, 8.8% of patients had a CNVM develop each year. Independent ri sk factors for the fellow eye were its glare recovery time in minutes (relative risk = 1.30, confidence interval = 1.10-1.54, P = 0.003) and its extent of visible macular abnormalities on a four-point scale (re lative risk = 1.62, confidence interval = 1.06-2.59, P = 0.03). Of the fellow eyes that converted, the interval to have a CNVM develop was i nversely related to the foveal electroretinogram implicit time. Conclu sions: A slower recovery from glare and more extensive funduscopic cha nges appear to be independent risk factors for the development of a CN VM in the fellow eyes of patients with unilateral neovascular AMD. A s lower foveal electroretinogram implicit time may be a sign of early st age CNVM development, perhaps because of outer retinal ischemia. These results have clinical management implications, particularly for those patients at high risk of having a potentially treatable form of AMD d evelop.