Question

Given below is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follows:

(i) Name the defect shown in the diagram.

(ii) Give two possible reasons for this defect of the eye in human beings.

(iii) Name the parts labeled 1 to 4.

(iv) Name the type of lens used to correct this eye defect.

Answer 1

(i) Myopia, Short-sightedness.

(ii) The possible reasons for this defect may be:

(1) The eyeball is lengthened from front to back.

(2) The lens is too curved.

(iii) (1) Vitreous chamber.

(2) Fovea centralis (yellow spot)

(3) Lens

(4) Pupil .

(iv) This defect can be corrected by suitable concave lens.