Question

What is longsightedness? How it is caused & how it is corrected?​

Answer 1

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A person with hypermetropia/hyperopia or long sight can see clearly objects far away from them, but not close to them. This is caused by the shape of the eye - the eyeball is slightly too short. It is corrected by spectacles or contact lenses with lenses which are 'plus' or convex in shape.

Answer 2

Answer:

Hypermetropia is also known as longsightedness. A person with hypermetropia can see distant objects clearly but can't see near objects, because the minimum focal length of eye lens of the person of hypermetropia is greater than 2.27cm.In such cases, the rays coming from a nearby object, after refraction at eye lens, forms an image beyond the retina. For correcting this disease we have to use convex. Most we can see this disease in old aged people.