What is the reason of weakness of vision? Why people wear different types of glasses?

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You must have seen different people wearing different types of glasses. Some have difficulty in near work and some have difficuly in far vision. This is due to the types of defects which are different in different people. Mostly the reason is variation in growth of eyeball.

Some people’s eyeballs are smaller than normal they are called hypermetropia. Some people’s eyeballs are larger than normal they are called myopic. Some people’s corneal surface is not equal in different meridians they are called astigmatic.

Hypermetropic people wear plus number glasses, myopic people wear minus number glasses, and astigmatic people wear cylinder number glasses.

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