The least distance of distinct vision for a young adult with normal vision is about:

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25 m

2.5 cm

25 cm

2.5m

answer is D.

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Detailed Solution

Concept: A healthy human eye can see clearly from infinity to a point near the eye after the eye is unable to form the picture or it becomes fuzzy. The smallest distance between the eye lenses and the object required to generate a clear image is defined as the distance of distinct vision.
Two concepts should be considered:
1. Farthest point: The distance at which a normal eye can see clearly is known as the farthest point.
Adults' eyes are capable of seeing infinity, or an endless distance.
2. The range of distance from the eyes at which they can see clearly is known as the near point, also known as least distinct vision. For a normally healthy eye, it is around 25 cm.
Adult eyes can see the item from a distance of 25 cm away.
Hence, the correct option is 4.

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