A person who is nearsighted can only create sharp images of close objects. Objects that are further away look fuzzy because the eye brings them in to focus at a point in front of the retina.
To correct for this a lens can be placed in front of the eye. What kind of lens is necessary?
We need a diverging lens to diverge the light rays just enough so that when the rays are converged by the eye they converge on the retina, creating a focused image.