Chapter No. 7. Lenses.

What are the differences between farsightedness and nearsightedness?

Farsightedness	Nearsightedness
A person suffering from this defect can see distant object 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.
Diagrammatic representation:	Diagrammatic representation:
Image is formed behind the retina.	Image is formed before the retina.
The distance between the eye lens and the retina decreases.	The distance between the eye lens and the retina increases.
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.