Glossary

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Large Print(also: Large Type, Enlarged Print, Giant Print)

Text or graphic material produced in a larger-than-standard font size to improve readability for people with low vision. Large print typically uses font sizes of 16 to 18 points or larger, though individual needs vary significantly depending on the type and degree of vision…

Lip-reading(also: Speechreading, Speech Reading, Visual Speech Perception)

The practice of understanding speech by visually interpreting the movements of the lips, face, and tongue, often used by deaf and hard-of-hearing individuals as a communication strategy. Lip-reading relies on watching the mouth region and facial expressions to decode spoken…

Luminance Contrast(also: Brightness Contrast)

The difference in perceived brightness between two adjacent surfaces or objects, as opposed to color contrast which involves differences in hue. Luminance contrast is particularly important for people with low vision, as many have difficulty distinguishing colors but can detect…

Luminous Efficiency Function(also: LEF, Spectral Luminous Efficiency Function, V(lambda))

A function that describes how the human visual system converts light intensity at different wavelengths into perceived brightness. The standard LEF used in WCAG contrast ratio calculations is based on a "standard observer" with typical colour vision. However, people with CVD —…

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