Visual Aberration

A deviation from ideal optical performance in the eye that causes images to appear blurred, distorted, or otherwise degraded on the retina. Visual aberrations include both lower-order aberrations (such as myopia, hyperopia, and astigmatism) and higher-order aberrations (such as coma, trefoil, and spherical aberration). Understanding and measuring these aberrations is important for accessibility because they directly affect how people with low vision perceive digital displays, and emerging research explores pre-compensating screen content to counteract specific aberrations.