Question

what is hypermetropia. state two reason due to which this defect is caused (Ray diagram correction​

Answer 1

This causes light rays to focus at a point in front of the retina, rather than directly on its surface. Nearsightedness also can be caused by the cornea and/or lens being too curved for the length of the eyeball. In some cases, myopia is due to a combination of these factors.

Answer 2

In this defect, the person can see far off objects clearly but cant see near by objects distinctly.The near point of the person is shifted away from normal near point (25cm).The image of near by objects is formed behind the retina.

Causes-1)Eye ball contracts

2)Eye lens becomes thin