Situational Visual Impairment

A temporary reduction in a person's effective vision or reading performance caused by the environment or context rather than by a medical condition. Common examples include trying to read a phone screen in bright sunlight, while walking or on a moving vehicle, in low light, or while tired or distracted. Situational visual impairments are a special case of situationally-induced impairments and disabilities (SIIDs); they affect almost every sighted user at some point and are increasingly treated as a target for mainstream accessibility features such as high-contrast modes, adaptive brightness, and adaptive typography, rather than as a niche concern.