Question

hello good morning friends

what do you understand by myopia? How we correct it.

Answer 1

Myopia is also called as nearsightedness. It is a defect in human eye. In this one can clearly see objects near him/her but can't see distant objects. This means the far point of the eye is not at infinity but shifts closer to the eye. In nearsightedness the image of a distinct object forms in front of retina. There are 2 reasons for myopia.

1. Th curvature of the cornea and the eye lens increases. The muscles near the lens can not relax so the lens remains large.

2. The eyeball elongates so that the distance between the lens and the retina increases.

This defect can be corrected by using spectacles with concave lens of proper focal length. This lens diverges the incident rays and these diverged ray can be converged by the lens in the eye to form the image on the retina. The focal length of concave lens is negative so a lens of negative power is required to correct myopia. The of the lens is different for different eyes depending on the magnitude of their myopia.

Answer 2

$good \: morning \: i \: hope \: its \: \\ help \: u \:$
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