Glossary
Searchable terminology from accessibility, web standards, and related fields.
26 results found in Vision.
- Trichromat (Trichromacy, Trichromatic Vision)
- A person with typical colour vision based on three types of functional cone cells (L, M, and S cones) in the retina, each sensitive to different wavelengths of light corresponding roughly to long (red…
- Vision Multiplexing (Visual Multiplexing)
- An optical engineering concept for low-vision aids that involves presenting multiple views or visual channels simultaneously to compensate for reduced visual function. In the context of assistive tech…
- Visual Aberration (Optical Aberration, Refractive Error)
- 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 (suc…
- Visual Crowding (Crowding)
- A perceptual phenomenon in which the presence of nearby flanking characters or objects makes it harder to recognise a target character, especially in peripheral vision or when the target is small, low…
- Wavefront Analyzer (Aberrometer, Wavefront Sensor)
- An optical instrument that measures how light waves are distorted as they pass through the eye's optical system, producing a detailed map of the eye's refractive characteristics called a wavefront abe…
- Zernike Polynomials (Zernike Coefficients, Zernike Modes)
- A set of mathematical functions used to describe the shape of optical wavefronts, commonly employed in ophthalmology and optometry to characterise the optical aberrations of the human eye. Each Zernik…