Question:
Under the National Programme for Control of Blindness, to define blindness, the visual acuity should be less than
Under the National Programme for Control of Blindness, to define blindness, the visual acuity should be less than
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NPCB defines blindness using the 3/60 visual acuity cut-off.
Updated On: Jul 7, 2026
- 3/60
- 6/60
- 1/60
- 6/24
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question.
The question asks for the visual acuity cut-off that India's National Programme for Control of Blindness (NPCB) uses to define blindness.
Step 2: Key Formula or Approach.
Visual acuity is written as a fraction, distance the person stands from the chart over the distance at which a person with normal sight can read the same line. A smaller fraction means poorer vision.
Step 3: Detailed Explanation.
Under NPCB guidelines, a person is counted as blind when the best corrected visual acuity in the better eye is less than 3/60, or when the visual field is reduced to less than 10 degrees around central fixation. 6/60 and 6/24 describe grades of low vision, not blindness, and 1/60 is stricter than the actual official cut-off.
Step 4: Final Answer.
The correct cut-off for defining blindness under NPCB is visual acuity less than 3/60.
The question asks for the visual acuity cut-off that India's National Programme for Control of Blindness (NPCB) uses to define blindness.
Step 2: Key Formula or Approach.
Visual acuity is written as a fraction, distance the person stands from the chart over the distance at which a person with normal sight can read the same line. A smaller fraction means poorer vision.
Step 3: Detailed Explanation.
Under NPCB guidelines, a person is counted as blind when the best corrected visual acuity in the better eye is less than 3/60, or when the visual field is reduced to less than 10 degrees around central fixation. 6/60 and 6/24 describe grades of low vision, not blindness, and 1/60 is stricter than the actual official cut-off.
Step 4: Final Answer.
The correct cut-off for defining blindness under NPCB is visual acuity less than 3/60.
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