Which factor is most closely associated with rating impairment for vision?

• A. Uncorrected vision only
• B. Only the worse eye
• C. Corrected vision with best practicable correction
• D. Only the better eye

Answer: (C)

Visual impairment ratings are based on the best possible vision with correction, because disability is driven by the eye that provides the most usable vision. This means using corrected vision with the best practicable correction, typically in the better eye, to reflect the actual functional impact. Uncorrected vision ignores what correction can achieve, and focusing only on the worse eye or on uncorrected vision would misrepresent the true level of impairment. Therefore, the best choice is the one that considers corrected vision with the best practicable correction.