Question

Which of the following row is giving the correct combination of all the three column ?

Column I	Column II	Column III
(1) Myopia	Long sightedness	Convex lens
(2) Hypermetropia	Near sightedness	Concave lens
(3) Presbyopia	Old age problem	Bifocal lens

Answer 1

$Myopia$ or near-sightedness is a defect in the vision, in which the person can see nearby objects but cannot see the distant objects distinctly after a certain limit.

The parallel rays coming from a distant object do not meet at the retina but at a point in front of the retina. $\therefore$ A myopic eye is corrected using a concave lens which diverges the parallel rays from distant objects so that a clear image is formed at the retina by the eye lens.

$Hypermetropia$ or long-sightedness is a defect in the vision, in which the person can see distant objects clearly but cannot see the nearby objects distinctly.

The rays coming from an object placed at normal near point do not meet at the retina but at a point behind the retina. $\therefore$ A hypermetropic eye is corrected using a convex lens which converges the rays from distant objects so that a clear image is formed at the retina by the eye lens.

$Presbyopia$ is the defect of eye in which a person cannot see farther as well as nearer objects clearly. This is due to the decrease in the power of accommodation of the eye with ageing.

Presbyopia 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).
Hence, the correct order is
$Myopia-Nearsightedness-Concavelens$
$Hypermetropia-Longsightedness-Convexlens$

$Presbyopia-Oldageproblem-Bifocallens$