Incident choroidal neovascularization in fellow eyes of patients with unilateral subfoveal choroidal neovascularization secondary to age-related macular degeneration: SST report No. 20 from the Submacular Surgery Trials Research Group.

OBJECTIVE: To describe incident choroidal neovascular lesions in fellow eyes of participants in the Submacular Surgery Trials who had age-related macular degeneration (AMD).
METHODS: Review of baseline fluorescein angiograms confirmed the absence of neovascular AMD in fellow eyes of 364 participants at risk. Subjects were eligible for a minimum of 2 years of follow-up with angiograms of eyes at risk reevaluated to estimate incidence rates of choroidal neovascularization (CNV) and to characterize these lesions. MAIN OUTCOME MEASURES: Incidence of CNV during follow-up, characteristics of the incident lesion (composition, size, and location), and visual acuity at the time of incidence.
RESULTS: Incident lesions were confirmed in 98 fellow eyes of participants, yielding 2- and 4-year cumulative incidence rates of 22% and 37%. Incident lesions were predominantly CNV in 87 fellow eyes (90%), extrafoveal in 29 fellow eyes (30%), and juxtafoveal in 9 fellow eyes (9%). Occult without classic CNV lesions were found in 64 eyes (67%), minimally classic CNV and predominantly classic CNV lesions in 12 eyes (13%) each, and predominantly blood lesions in 4 eyes (4%). Nearly two-thirds of all incident lesions were 3 disc areas or smaller in size. Median visual acuity decreased from 20/25 at baseline to 20/250 at the 4-year follow-up in fellow eyes with incident CNV. CONCLUSIONS AND APPLICATION TO CLINICAL PRACTICE: Frequent angiographic follow-up of fellow eyes at risk for CNV may lead to earlier detection and treatment of neovascular AMD and better visual acuity outcomes.

RCT Entities:   Population Interventions Outcomes