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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WHO/India's blindness cutoff is much stricter than normal driving vision.
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 Concept.
The National Programme for Control of Blindness (NPCB) in India uses a fixed visual acuity cutoff to decide who counts as blind for programme and survey purposes.
Step 2: Key Formula or Approach.
Visual acuity is written as a fraction, the distance at which the patient reads the chart over the distance a person with normal vision would read the same line. Normal vision is 6/6. The blindness cutoff used in India is visual acuity in the better eye with the best possible correction that is less than 3/60.
Step 3: Detailed Explanation.
A person with vision of 6/60 can still see a big letter at 6 metres that a normal eye reads at 60 metres, and is classified as having low vision or severe visual impairment, not blindness, under the Indian definition. Vision of 1/60 is worse than the blindness cutoff and would definitely be labelled blind, but it is not the exact threshold value used to define the category. 6/24 represents mild to moderate visual impairment, far above the blindness range. The accepted cutoff used specifically to define blindness under NPCB is vision less than 3/60.
Step 4: Final Answer.
Blindness under NPCB is defined as visual acuity less than 3/60 in the better eye.
\[ \boxed{3/60} \]
The National Programme for Control of Blindness (NPCB) in India uses a fixed visual acuity cutoff to decide who counts as blind for programme and survey purposes.
Step 2: Key Formula or Approach.
Visual acuity is written as a fraction, the distance at which the patient reads the chart over the distance a person with normal vision would read the same line. Normal vision is 6/6. The blindness cutoff used in India is visual acuity in the better eye with the best possible correction that is less than 3/60.
Step 3: Detailed Explanation.
A person with vision of 6/60 can still see a big letter at 6 metres that a normal eye reads at 60 metres, and is classified as having low vision or severe visual impairment, not blindness, under the Indian definition. Vision of 1/60 is worse than the blindness cutoff and would definitely be labelled blind, but it is not the exact threshold value used to define the category. 6/24 represents mild to moderate visual impairment, far above the blindness range. The accepted cutoff used specifically to define blindness under NPCB is vision less than 3/60.
Step 4: Final Answer.
Blindness under NPCB is defined as visual acuity less than 3/60 in the better eye.
\[ \boxed{3/60} \]
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