Which term is used when an individual has no access to useful visual input?

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Blindness is the appropriate term to describe a condition where an individual has no access to useful visual input. It encompasses a range of visual impairments, but when specifically referring to a complete lack of functional vision, the term "blindness" is most fitting.

This designation is often used in both clinical and educational contexts to indicate that an individual's eyesight does not contribute meaningfully in a way that would enable them to engage with the world visually.

Terms such as "legally blind," "functionally blind," and "low vision" are related to varying degrees of visual impairment but do not encapsulate the complete absence of functional sight as "blindness" does. "Legally blind" refers to individuals whose vision does not exceed a certain threshold but may still retain some useful sight, while "functionally blind" suggests very limited vision capacity that still might allow for some visual input. "Low vision" describes individuals who have reduced vision but may still benefit from visual aids or adaptations. Each of these terms represents a spectrum of visual capabilities, underscoring why "blindness" is the most precise term for total lack of useful visual input.

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