With reference to the functioning of the eye, answer the questions that follow :
(a) What is meant by power of accommodation of the eye?
(b) What is the shape of the lens during (1) near vision (2) distant vision?
(c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.
(d) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.
The following diagram represents a certain defect of vision of the human eye. Name the defect.