Anatomically, there are differences between a nearsighted and a farsighted eye. A nearsighted eye would typically be considered "longer" than a perfect eye, whereas a farsighted eye would be ...

"In people who are nearsighted, the light that enters the eye is focused in front of the retina, usually because the eye is too long." This means that your eye extends outward in an oval shape ...

Two common defects of the eyes are myopia (short-sightedness ... can be corrected by placing a concave lens in front of the eye, as shown in the diagrams below. Someone who is long-sighted ...