Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Violation Score(also: Accessibility Score, A11y Score)
- A numerical metric used to quantify the severity and prevalence of accessibility violations on a web page or within a dataset. Violation scores typically map qualitative impact levels (cosmetic, minor, moderate, serious, critical) to numerical values, enabling quantitative…
- Visual acuity(also: 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 with normal vision sees at 200 feet. Visual acuity of 20/200 or worse in the…
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