Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Farnsworth D-15 Test(also: D-15 Color Test, Farnsworth Dichotomous Test)
- The Farnsworth D-15 test is a clinical assessment used to evaluate color perception by asking a person to arrange 15 colored caps in order of hue. The pattern of errors reveals the type and severity of color vision deficiency, distinguishing between protan (red), deutan (green),…
- Fixation Problem(also: Reading Fixation Difficulty, Visual Fixation Issue)
- A difficulty in maintaining stable visual focus on a specific point or line of text during reading. People with fixation problems may lose their place frequently, skip lines, or re-read the same passage unintentionally. This is a common challenge for dyslexic readers and can be…
- Fovea(also: Foveal Vision, Fovea Centralis)
- The small, central area of the retina responsible for sharp, detailed vision, covering approximately 1 degree of visual angle. The fovea contains the highest density of cone photoreceptors and provides the clearest visual acuity, which is why people move their eyes to point the…
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