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What are the short sight and long sight problems and how these can be treated?

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What are the short sight and long sight problems and how these can be treated?

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Ans. Disorders of the Eye
The working of eye is affected by the changes in the shape of eyeball.
Myopia (Short sight)
The elongation of eyeball results in myopia. Such persons are not able to see distant objects clearly. The image of a distant object is formed in front of retina. This problem can be rectified by using concave lens.
Hypermetropia (Long sight)
It happens when eyeball shortens. Such persons are not able to see near objects clearly. The image is formed behind retina . Convex lens is used to rectify this problem. Figure 12.9

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