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Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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Blue Cone Monochromatism(also: BCM, S-cone Monochromacy)
A rare inherited vision condition in which only the blue (short-wavelength) cones function, resulting in severely reduced color vision, reduced visual acuity, photophobia, and nystagmus. Affected individuals see the world in shades of blue and yellow and typically benefit from…
Blurred Vision Simulation(also: Vision Simulation, Low Vision Simulation)
A technique used in accessibility evaluation where evaluators simulate the visual experience of people with reduced visual acuity by artificially blurring their view of a website or application. Methods include using low vision simulation glasses (commercially available from…
Brightness Contrast(also: Luminance Contrast, Perceived Brightness Difference)
The difference in perceived brightness between two colors, typically between text and its background. Brightness contrast is a key factor in readability, especially for people with low vision, color vision deficiencies, or those viewing content in challenging lighting…

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