Question

what are the causes of hypermeteropia​

Answer 1

Explanation:

Axial hypermetropia: Axial hypermetropia is the commonest type. The total refractive power of the eye is normal but there is axial shortening of the eyeball. About 1 mm shortening of the antero-posterior length of the eye results in about 3 Dioptres (D) of hypermetropia.

Curvature hypermetropia: Curvature hypermetropia is that condition in which curvature of the cornea, lens or both is increased (flatter) than the normal, resulting in change in refractive power of the eye. About 1 mm increase in radius of curvature results in 6 D of hypermetropia.

Index Hypermetropia: Index Hypermetropia occurs due to change in refractive index of the crystalline lens with age.

Positional hypermetropia: Positional hypermetropia results from posteriorly placed crystalline lens of the eye.

Absence of crystalline lens: Absence of crystalline lens either congenital absence or acquired (following surgical removal or posterior displacement) leads to aphakia. There is high hypermetropia in aphakia.

Answer 2

Answer:

In hypermetropia....our eye lens become thinner or our eyeballs become smaller.

In hypermetropia when we are looking far we can see things clearly...but when an object is at a close distance say less than 25cm the object looks hazy because the image gets formed behind the retina. Hence, so.

Explanation:

To correct hypermetropia a convex lens is used.

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