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

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?
(c) Name an old-age eye defect. What causes it?
(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.