Question

distinguish between myopia and hypermetropia.answer in detail

Answer 1

Hello! dear,

you answer goes like this ...

Myopia:

Myopia is also called as near sightedness.
In this case,The person can see nearby object clearly but cannot see a distant object distinctly.
This is caused when the light rays from a far away object falls  at a distance just before the retina.
It can be treated by using concave lenses of suitable power.
It is caused due to excessive curvature of eye lens or elongation of eye ball.
Hypermetropia:
It is called farsightedness.
In this case case the person can see distant object clearly but cannot see a nearby object distinctly.
This is caused When the light rays from a nearby object falls at a distance behind the retina.
It can be treated by using convex lenses of suitable power.
It is caused when the eye ball is short and when power of eye lens decreases.

Thank you dear,

Hope it helps you.

Answer 2

Heya,

Myopia :
* The far point of a person with this defect becomes closer than infinity.

* This defect arise due to increase in the curvature of the eye lens or decrease in the focal length of the eye lens or elongation of eyeballs.

* In this defect, the image of the distant object is formed in front of retina.

* This defect can be corrected by using spectacles having diverging lens of suitable power.

Hypermetropia :
* The near point of a person with this defect becomes greater than the normal near point.

* This defect arise due to decrease in the curvature of the eye lens or increase in focal length of the eye lens or the eyeball has become too small.

* In this defect the light rays from the nearby objects are focused at a point behind the retina of the eye.

* This defect can be corrected by using a spectacles having converging lens of suitable power.

Hope this helps you....:)