According to WHO definitions (2019 revision), moderate visual impairment is defined as best corrected visual acuity (BCVA) in the better eye of:
- A < 6/18 to ≥ 6/60 ✓
- B < 3/60 to ≥ 1/60
- C < 6/6 to ≥ 6/12
- D < 6/60 to ≥ 3/60
Correct answer: A. < 6/18 to ≥ 6/60
Explanation
The 2019 WHO ICD-11 classification defines: mild VI = < 6/12 to ≥ 6/18; moderate VI = < 6/18 to ≥ 6/60; severe VI = < 6/60 to ≥ 3/60; blindness = < 3/60 (or visual field < 10 degrees around central fixation). Previously, blindness was defined as < 6/60 (3/60 by WHO), but the current BCVA-based definition for blindness in the better corrected eye is < 3/60. Option D defines severe visual impairment.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
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Written and medically reviewed by the StethoPrep medical team.