(1) What is hypermetropia or farsightedness? What are the
possible reasons of hypermetropia? How is hypermetropia
corrected? Explain with diagrams.
Answers
Answer:
A person suffering from hypermetropia can clearly see distinct objects but faces difficulty in clearly seeing surrounding objects. This is because the eye lens focuses the incoming divergent rays beyond the retina. This vision defect is corrected by the use of a convex lens. ... This is also known as farsightedness.
or
(a) Hypermetropia or Long Sightedness is an eye defect. A person suffering from it can see distant objects clearly but is not able to see nearby objects clearly.
(b) Hypermetropia is caused due to slight flattening of the eye ball and the image is formed behind the retina.
(c) The weak action of the ciliary muscles causes low converging power of eye lens.
(d) The distance between eye lens and the retina decreases due to the flattening or shortening of the lens. This increases the focal length of the eye lens.
(e) This defect can be corrected by wearing spectacles having a convex lens which are of suitable focal length. The power of convex lens depends upon the degree of defect in the eye, it varies from person to person. The power of spectacles for a hypermetropic eye is positive because the focal length of the convex lens is positive.
Answer:
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