causes of myopia and hypermetropia

Shortening of the eyeball, that is, the eyeball becomes smaller Increase in focal length of the eye lens Let us now see how this defect is rectified. A long sighted eye forms image of a nearby object behind the retina. Thus, long sightedness is due to the decreased converging power of the le..

Astigmatism is the most common vision problem resulting in distorted images, as light rays are prevented from meeting at a common focus. Astigmatism may accompany Hypermetropia or Myopia What Causes Astigmatism? Normally the cornea is spherical in shape But in an..

Question: Name any two defects of eye? Answer: Myopia and hypermetropia are the most common defects of ey..

Question: What causes myopia? Answer: Myopia is caused due to the 1) Shortening of the eyeball 2) Increase in focal length of the eye-len..

A normal eye can see all objects over a wide range of distances i.e., from 25 cm to infinity. But due to certain abnormalities the eye is not able see objects over such a wide range of distances and such an eye is said to be defective. Some of the defects of vision are Hypermetropia or..

Defects of Vision - A normal eye can see all objects over a wide range of distances i.e., from 25 cm to infinity. But due to certain abnormalities the eye is not able see objects over such a wide range of distances and such an eye is said to be defective. Some of the defects of vision are Hype..

">Refractive Errors or Defects of Vision The abnormalities in the normal vision of the eye due to the change in focal length of the lens or due to the deformation of cornea are known as refractive errors or defects of vision. Myopia Myopia is an eye defect due to which the eye i..

Presbyopia is caused when the centre of the eye lens hardens making it unable to accommodate near vision. This condition generally affects almost everyone over the age of 50 - even those with myopia. Eyeglasses with bifocal or progressive lenses are prescribed to correct or imp..