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(5)Differentiate between : Hypermetropia and Myopia

Answer»

Myopia is also called as Near-sightedness.Hypermetropia is called as Far-sightedness.

NATUREIn Myopia, the person can see nearby objects, but cannot see far objects clearly.In Hypermetropia, the person can see far objects clearly, but cannot see near objects clearly.

IMAGEIn people with myopia, the image is formed in front of retina in the eye.In people with hypermetropia, the image is formed behind the retina in the eye.

EYE-BALLThe size of the eye-ball increases in the myopic people.The size of the eye-ball decreases in the hypermetropic people.

FOCAL LENGTHIn myopia, the focal length of the eye lens decreases.In hypermetropia, the focal length of the eye lens increases.

CORRECTED USINGMyopia can be corrected using Double-Concave lens.Hypermetropia is corrected using the Double-Convex lens.

LENSTo correct myopia, we need to select a lens which forms an image at the far point for an object at infinity.To correct hypermetropia, we need to use lens which forms an image of an object beyond near point when an object is placed between near point and least distance of clear vision.

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