Glossary

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Page Magnification(also: Page Zoom, Web Page Magnification)

An accessibility feature that enlarges the entire visual presentation of a web page, including text, images, and layout elements, to make content easier to see for people with low vision or visual fatigue. Unlike text-only size increases, page magnification scales all page…

Pattern Glare

A visual perceptual phenomenon where repeated striped or lined patterns cause discomfort, headaches, eyestrain, or visual distortions such as flickering, shimmering, or apparent movement. Pattern glare particularly affects people with dyslexia, epilepsy, and migraine, and can be…

Precompensation(also: Display Precompensation, Image Precompensation)

A technique in visual accessibility that pre-modifies displayed images in a way that is opposite to the optical distortion introduced by a user's eye, so that the image arriving at the retina more closely resembles the intended original. Precompensation works analogously to an…

Private Visual Content(also: PVC, Visual Privacy)

Private visual content (PVC) refers to visual information in images or videos that the person depicted or sharing the content considers private and would not want publicly disclosed. For people who are blind using visual interpreter services, PVC is a particular concern because…

Protanomaly(also: Protan Anomalous Trichromacy)

A type of colour vision deficiency where the long-wavelength (red) cone cells have a shifted sensitivity range rather than being absent entirely. Protanomaly is a milder form of protan CVD compared to protanopia, resulting in reduced but not absent ability to distinguish reds…

Protanopia(also: Protan Dichromacy, Red-Blind)

A type of colour vision deficiency caused by the complete absence of long-wavelength (red) cone cells in the retina. People with protanopia cannot distinguish between red and green and perceive reds as significantly darker than people with typical colour vision. This darkening…

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