The least distance of distinct vision for a normal human eye is approximately:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 25 cm.
The least distance of distinct vision (or near point) for a normal human eye is 25 cm (or 250 mm). This is the minimum distance at which an object can be held and seen clearly without strain by a young adult, though this distance increases with age.
Key Details:
- Definition: The closest distance an object can be placed to the eye to form a sharp image on the retina.
- Normal Value: 25 cm.
- Variation: While 25 cm is standard for adults, it can be 5–8 cm for infants.
- Maximum Limit: The eye can see objects distinctly at a maximum distance (far point) of infinity.