Unilateral Cilioretinal Artery and Advanced Age-Related Macular Degeneration: A Retrospective Cross-Sectional Study

Abstract

To investigate the association between the presence of a cilioretinal artery (CRA) and advanced age-related macular degeneration (AMD), including the prevalence of choroidal neovascularization (CNV) and geographic atrophy (GA). Retrospective cross-sectional study. This was a single-center study. A total of 738 patients with AMD who underwent optical coherence tomography angiography (OCTA) were included in the study. Fundus photographs were reviewed to determine the presence of the CRA. In patients with a unilateral CRA, paired tests were performed between eyes with and without the CRA to compare AMD severity and prevalence of CNV and GA. The main outcomes of interest were AMD stage and prevalence of CNV and GA. Macular vasculature, including vessel density, perfusion density, and foveal avascular zone, were examined using OCTA. A total of 174 eyes from 87 patients with a unilateral CRA were examined. A total of 27.8% and 8.1% of patients had a CRA in 1 eye and both eyes, respectively. Eyes with a CRA showed lower AMD stage (4-step AREDS category; P=.037) and a lower prevalence of CNV (23.0% vs 41.4%; P=.024) than those without a CRA. The prevalence of GA and macular vessel density, perfusion density, and foveal avascular zone measured by OCTA were similar in both groups. In the eyes with a CRA, AMD stage and prevalence of CNV were lower than those in the eyes without a CRA. However, the effect of the CRA on the macular vascular system remains unclear.