Question

i.recognise the defect ii.write the reason for the defect .iii. write in brief about the correction .​

Answer 1

Answer:

I. Hypermetropia

ii. Reduced size of the eyeball. The image is being formed behind the retina.

iii. Hypermetropia can be corrected using a convex lens. It will help to shift the image formation on the retina.

Answer 2

Answer:

I).hypermetropia

2).In case of hypermetropia the image of an object is formed behind the retina and therefore, a person cannot see clearly nearby objects. The near-point of an eye having hypermetropia is more than 25 cm. The condition of hypermetropia can be corrected by putting a convex lens in front of the eye.

3).As hyperopia results from the visual image being focused behind the retina, it has two main causes: Low converging power of eye lens because of weak action of ciliary muscles. Abnormal shape of the cornea.

Causes: Too short an eyeball, misshapen lens or cornea

Other names: Hypermetropia, hyperopia, longsightedness, long-sightedness

Diagnostic method: Eye exam

Symptoms: Close objects appear blurry

3).the absence of other diseases, the condition of hypermetropia may be corrected with restoration of normal visual function. This may be achieved with spectacles or contact lenses. Basic principle of therapy is to converge and focus the light rays on the retina with the help of convex (plus) glasses.

Symptoms: Blurred vision

Treatments: LASIK

Explanation:

hope it helps............