The WHO definition of blindness used in India's National Programme for Control of Blindness (NPCB) is visual acuity less than:

• A 6/60 in the better eye with best correction
• B 6/18 in the better eye with best correction
• C 1/60 in the better eye with best correction
• D 3/60 (finger counting at 3 meters) in the better eye with available correction ✓

Explanation

India's NPCB uses the WHO definition of blindness as visual acuity of less than 3/60 (finger counting at 3 meters) in the better eye with available correction, corresponding to less than 6/60 for program-level reporting in some contexts. The globally accepted ICD threshold for blindness is <3/60 (or <10° visual field) in the better eye. For NPCB reporting, the threshold of <6/60 is used for 'visual impairment,' while <3/60 defines blindness. For examination purposes, <3/60 in the better eye is the standard definition.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.