Which term best describes the amount of vision a person has that can be used functionally?

• A. Residual vision
• B. Low vision
• C. Snellen eye chart
• D. Phoric

Answer: (A)

Residual vision is the amount of vision a person can still use functionally, with or without assistive devices. It describes how much usable sight remains for everyday tasks like reading, recognizing faces, or navigating a room, which is exactly what practitioners consider when planning supports and accommodations. Low vision describes a level of impairment overall, not the specific amount of vision someone can use. The Snellen eye chart measures visual acuity—how clearly a person sees letters at a distance—not the total usable vision for daily tasks. Phoric relates to eye alignment or binocular control, not how much vision can be used. So the term that best fits the idea of usable vision is residual vision.