Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Vision Multiplexing(also: 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 technology, vision multiplexing allows users to see both a wide field of view and a…
- Vision Therapy(also: Visual Training, Orthoptics, Eye Training)
- A program of visual activities and exercises prescribed to improve visual skills and processing, often used to treat conditions like amblyopia, strabismus, and convergence insufficiency. Vision therapy can include in-office sessions and at-home exercises, and increasingly…
- Visual Aberration(also: 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 (such as myopia, hyperopia, and astigmatism) and higher-order aberrations (such as…
- Visual Acuity
- A measure of the sharpness or clarity of vision, typically expressed as a fraction (e.g., 20/20) or percentage indicating the smallest detail a person can resolve at a standard distance. Visual acuity is one of the primary metrics used to classify the degree of visual…
- Visual Clutter(also: Visual Noise, Visual Complexity)
- An excess of visual elements in an environment or interface that makes it difficult to locate, identify, or focus on relevant information. Visual clutter is a significant barrier for people with cerebral visual impairment, simultanagnosia, and other visual processing conditions,…
- Visual Crowding(also: 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-contrast, or briefly viewed. Crowding jointly with limited visual span sets an…
- Visual Field Loss(also: Visual Field Deficit, VFL, Field Loss)
- A reduction in the area of vision that a person can see without moving their eyes or head. Visual field loss can affect any portion of the visual field — central, peripheral, or specific quadrants — and can result from conditions affecting the eyes (glaucoma, retinal detachment)…
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