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-The power of accommodation of the eye usually decreases with ageing. For most people, the near point gradually recedes away.
-They find it difficult to see nearby objects comfortably and distinctly without corrective eye-glasses. This defect is called Presbyopia.

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-Myopia is also known as near-sightedness
-A person with myopia can see nearby objects clearly but cannot see distant objects distinctly

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-This defect can be corrected by using a convex lens of appropriate power
-Glasses used to correct presbyopia may be simple reading glasses, bifocals, trifocals, or progressive lens.

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-It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens

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-This defect can be corrected by using aconvex lens of suitable power
-Eye converging lenses provide the additional focussing power required for forming the image on the retina

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-The focal length of the eye lens is too long
-The eyeball has become too small

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-Hypermetropia is also known as far sightedness
-A person with hypermetropia can see distant objects clearly but cannot see nearby objects clearly

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-This defect can be corrected by using a aconcave lens of suitable power
-A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected

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-Excessive curvature of the eye lens
-elongation of the eyeball

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(i)Myopia or near- sightedness
(ii)Hypermetropia or far-sightedness
(iii)presbyopia