Differences in baseline dark and the dark-to-light changes in anterior chamber angle parameters in whites and ethnic chinese

Abstract

Purpose. To assess the anterior chamber drainage angle width in the dark and the dark-to-light change (Δ) between Caucasians and Chinese aged 40 years and older. Methods. The study groups comprised four age- and sex-matched cohorts: American Caucasians, American Chinese, southern mainland Chinese, and northern mainland Chinese. Anterior segment optical coherence tomography (ASOCT) images of the anterior chamber angles were obtained under both light and dark conditions. The parameters analyzed included angle opening distance (AOD), angle recess area (ARA), and trabecular-iris space area (TISA). Results. Data were obtained from 121, 124, 121, and 120 participants who were American Caucasians, ..