Asked by Anjanasubhash | 8th Aug, 2009, 08:51: AM

Expert Answer:

our eyes can see objects kept beyond 25 cm without any strain but for objects kept at distances less than 25 cm, eyes have to adjust its focal length and this causes strain. In this condition the person can't see objects for longer periods.

Answered by  | 10th Aug, 2009, 10:16: AM

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