Determine which eye defect/ correction is the given image.

Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.

Instead of on a retina, in a myopic eye, the image of a distant object is formed in front of the retina.

This defect can be corrected by using a concave lens of suitable power. 

The given image is the correction of myopia. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.