In the WHO categorisation of visual impairment using best corrected visual acuity in the better eye, 'severe visual impairment' corresponds to acuity ranging from:

• A Less than 6/12 to 6/18
• B Less than 6/18 to 6/60
• C Less than 3/60 to no light perception
• D Less than 6/60 to 3/60 ✓

Explanation

Category 3 of the ICD classification defines severe visual impairment as best corrected acuity worse than 6/60 but equal to or better than 3/60 in the better eye. Category 1 and 2 describe moderate impairment down to 6/60, while category 4 and 5 constitute blindness below 3/60. Option B describes moderate visual impairment, and option C describes blindness, so both fail to match the severe impairment band.

Reference: Parsons' Diseases of the Eye, 23rd ed.

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Written and medically reviewed by the StethoPrep medical team.