what is the difference between metropic eye and presbiopic eye ???

Myopiais a defect of vision in which a person clearly sees all the nearby objects but is unable to see the distant objects comfortably.A myopic eye forms the image of a distant object in front of its retina.

Myopia is caused by

(i)Increase in curvature of the lens

(ii)Increase in length of the eyeballMyopia is corrected using a concave lens.Presbyopiais a common defect of vision which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively. A presbyopic eye has its near point greater than 25 cm and it gradually increases as the eye becomes older.It may also happen that a person suffers from both myopia and hypermetropia. This type of defect can be corrected by using bi-focal lenses. A bifocal lens consists of both convex lens (to correct hypermetropia) and concave lens (to correct myopia).

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