Question

Distinguish between:

Farsightedness and Nearsightedness.

Answer 1

	Farsightedness	Nearsightedness
1.	This problem arises due to slight flattening of the eyeball.	This problem arises due to slight elongation of the eyeball.
2.	The curvature of the cornea and eye lens decreases so that the converging power becomes less.	The curvature of the cornea and eye lens increases so that the converging power becomes more.
3.	The distance between the eye lens and the retina decreases.	The distance between the eye lens and the retina increases.
4.	The near point of the eye shifts farther away from the eye.	The far point of the eye shifts closer to eye.
5.	A person suffering from this defect can see distant objects clearly but is unable to see nearby objects.	A person suffering from this defect can see nearby objects clearly but is unable to see distant objects.
6.	It can be corrected by using spectacles having convex lenses of suitable focal length.	It can be corrected by using spectacles having concave lenses of suitable focal length.