what is Myopia ,Hypermetropia,Biopia
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it is pressbiopkia
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Myopia:
Myopia is called as shortsightedness. In this case the person can see a 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 is caused due to excessive curvature of eye lens or elongation of eye ball. It can be avoid by using concave lens.
Hypermetropia:
It is called as farsightedness. In this case the person can see a 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 avoid by using convex lens. It is caused when eye ball is too short and when power of lens decreases.
presbiopia: It can be seen in old ones who have no clearance to see bothnear and far objects.
Myopia is called as shortsightedness. In this case the person can see a 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 is caused due to excessive curvature of eye lens or elongation of eye ball. It can be avoid by using concave lens.
Hypermetropia:
It is called as farsightedness. In this case the person can see a 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 avoid by using convex lens. It is caused when eye ball is too short and when power of lens decreases.
presbiopia: It can be seen in old ones who have no clearance to see bothnear and far objects.
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