eye defects

In the myopia eye defect, the rays of light

The eye defect, Astigmatism can be corrected by using , -

Given below is a diagram showing defect of human eye . Name the type of lens used to correct the eye defect.

Observe the following diagram and answer the questions. Which eye defect is shown in this diagram ?

Observe the following diagram and answer the questions. What are the possible reasons for this eye defect ?