Lenses are used to make glasses in order to correct vision issues. Do some research about...

Lenses are used to make glasses in order to correct vision issues. Do some research about vision deficiencies, what causes them and how we can utilize different types of lenses to fix them

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Expert Solution

There are mainly three types of vision disorders:

Nearsightedness/Myopia : Myopia is often called nearsightedness, because people who have it can only see nearby objects in sharp focus.

Cause: It is caused by too much curvature of the cornea relative to the length of the eyeball. This causes the light rays in the eye to be focused in front of the retina instead of on it.

Correction lens : concave lens

Farsightedness/ Hypermetropia :
Hypermeteopia, or farsightedness, is just the opposite – people with it can see clearly far away, but not close up.

Cause :It is caused by insufficient curvature of the cornea relative to the length of the eyeball. This puts the focal point of the light rays behind the retina instead of on it.

Correction lens : convex lens

Presbyopia :

Presbyopia is an age-related condition that occurs as the lens loses its ability to change shape. This reduces the eye’s ability to adjust for different distances, especially close up, so that the weakly bundled light rays are not focused at the retina.

Cause : Age factor.

Correction lens : bifocal lens (both concave and convex lens)

Astigmatism :

In astigmatism, the cornea is misshapen and does not properly focus the light entering the eye. Instead of hitting the retina in a focused point, the light is spread over two or more points. The result is a blurry or stretched image.

Correction lens : toric lenses, they can bend light more in one direction than the other.

genius_generous answered 1 year ago

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