CBSE - X - Physics - The Human Eye and The Colourful World
Defects of eye
Presbyopia is a condition, caused by aging, in which people find it difficult to read small words at close distances or to work on the computer for long periods of time.
Presbyopia may seem to occur suddenly, the actual decline takes place over the course of many years, it usually becomes noticeable in the early to mid-forties.
Presbyopia is a natural aging process of the eye. The lens becomes less flexible, more thickened and accommodation is gradually lost.
Presbyopia can also be combined with short sight, long sight or astigmatism.
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