Question

Distinguish between: a. Farsightedness and Nearsightedness

Answer 1

Farsightedness (hypermetropia)	Nearsightedness (Myopia)
In hypermetropia, person clearly sees all the far away objects, but is unable to see the nearby objects comfortably and clearly.	In Myopia, person clearly sees all the nearby objects, but is unable to see the distant objects comfortably and clearly.
It is caused due to decrease in curvature of eye lens or decrease in length of eyeball.	It is caused due to increase in curvature of eye lens or increase in length of eyeball.
In this defect, image is formed behind the retina.	In this defect, image is formed in front of the retina.
It is corrected using convex lens.	It is corrected using concave lens.