Name the defect of vision in which the eye-lens loses its power of accommodation due to old age.

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Solution

Presbyopia

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Q. Fill in the blanks:

An aged person suffering from __________, caused by the weak accommodation power of the eye lens associated with old age, should wear _________ lenses.

What is the name of the disease caused in old age when eyesight becomes foggy due to the eye lens becoming cloudy?

A defect of eye which results when the lens loses its transparency:

Name the eye defect in which eye lens becomes cloudy or milky. Mention the method for its correction. A person uses a lens of power -1.0 D for correcting his distant vision and for correcting his near vision he uses a lens of power + 2.0 D. Calculate the focal length of the lenses required to correct these defects. Explain why a normal eye is not able to see clearly the objects placed closer than the near points.

Answer the following :
(a) What is the function of the lacrimal gland and where is it situated in the body?
(b) In what two ways is the yellow spot different from the blind spot?
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(d) What is meant by power of accommodation of the eye?

(e) Mention the characteristics of the image that falls on the retina of the eye.

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