Glossary
Searchable terminology from accessibility, web standards, and related fields.
70 results found in low vision.
- Tunnel Vision (Peripheral Vision Loss, PVL)
- A visual impairment characterized by the loss of peripheral vision while central vision may remain intact, resulting in a narrow field of view as if looking through a tunnel. Tunnel vision can be caus…
- Video Magnifier (CCTV Magnifier, Electronic Magnifier, Desktop Video Magnifier)
- An assistive device that uses a camera to capture and display magnified images of printed material, objects, or other visual content on a screen. Video magnifiers range from portable handheld units to…
- Vision Rehabilitation (Visual Rehabilitation)
- See Low-Vision Rehabilitation. A comprehensive set of services and interventions designed to help people with vision loss maximize their remaining vision and develop adaptive strategies for independen…
- Visual Acuity (VA, Sharpness of Vision)
- A measure of the eye's ability to distinguish fine details and shapes at a given distance. Visual acuity is commonly expressed as a Snellen fraction (e.g., 20/20, 20/200) or in logMAR units used in cl…
- Visual Fatigue (Eye Strain, Asthenopia, Visual Strain)
- Discomfort, tiredness, or reduced visual performance resulting from prolonged or intensive visual tasks. For people with low vision, visual fatigue can occur more quickly because they must exert great…
- Visual Field (Field of Vision)
- The total area visible to a person when their eyes are fixated on a central point, including both central and peripheral vision. Visual field can be measured in degrees and is assessed through perimet…
- Visual Search Strategy (Scanning Strategy, Visual Scanning)
- Systematic approaches to visually exploring an environment or scene to locate specific objects, patterns, or information. In low-vision rehabilitation, therapists train clients in efficient search str…
- Visual acuity (VA, LogMAR acuity, Snellen acuity)
- A measure of the sharpness or clarity of vision, typically expressed as a Snellen fraction (e.g., 20/20, 20/200) or LogMAR value. A person with 20/200 vision must be 20 feet away to see what someone w…
- Visual field loss (Peripheral vision loss, Scotoma, Tunnel vision, Visual field defect)
- A reduction in the area of vision that a person can see, either in the periphery (peripheral vision loss or tunnel vision) or in the center (central vision loss or central scotoma). Visual field loss …
- ZoomText
- A commercial screen magnification and screen reading software for Windows, developed by Freedom Scientific (formerly Ai Squared). ZoomText provides up to 60x magnification along with features like smo…