i. Which eye defect is shown in this diagram? ii. What are the possible reasons for this eye defect?

Question

Observe the following diagram and answer the questions.

i. Which eye defect is shown in this diagram?

ii. What are the possible reasons for this eye defect?

iii. How is this defect corrected? Write it in brief.

Answer 1

i. Myopia or Nearsightedness

ii. Possible reasons for the defect:

(i) The curvature of the cornea and the eye lens increases. The muscles near the lens cannot relax so that the converging power of the lens remains large.

(ii) The eyeball elongates so that the distance between the lens and the retina increases.

(c) Correction of the defect: This defect can be corrected using spectacles with concave lenses. A concave lens diverges the incident rays and these diverged rays can be converged by the lens in the eye to form an image on the retina.