Question

what are the causes of myopia and hypermetropia​

Answer 1

Answer:

Both myopia (short-sightedness) and hypermetropia (far-sightedness) are common eye conditions that occur when light does not focus on the retina properly. Both conditions are easily corrected using prescription glasses or contact lenses or, in mild cases, by laser eye surgery.

Answer 2

Answer:

$\bigstar \: \sf\red{Myopia} \:$

Myopia is a defect of the eye due to which the eye is not able to see distant objects clearly . In such an eye , the light rays from a distant object , arriving at the eye lens, get converted at a point in front of retina .

This defect may arise due to either -

$\bf{. \: excessive \: curvature \: of \: the \: cornea \: } \\ \\ \bf{. \: elongation \: of \: the \: eyeball \: } \:$

This defect can be corrected by using a concave (diverging) lens of appropriate focal length

$\bigstar\sf \: \red{Hypermetropia}$

We may have seen some middle aged people holding a book somewhat away from their eyes to read it properly . This is because they are suffering from hypermetropia . In this case the image of a nearby object gets formed behind the retina.

This defect arises due to either -

$\bf{. \: the \: focal \: length \: of \: the \: eye \: } \\ \bf{ lens \: becoming \: too \: large \: }$

$\bf{. \: or \: the \: eyeball \: getting \: shortened }$

this defect can be corrected by using convex (converging) lens of appropriate focal length

Explanation:

i hope it helps ;-)

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