Nearsightedness and farsightedness are caused by the
A) density of the aqueous and vitreous humor.
B) length of the eyeball.
C) shape of the cornea.
D) shape of the lens.
E) positioning of the rods and cones.

Question

Quizplus · Accepted Answer

Nearsightedness (myopia) and farsightedness (hyperopia) are primarily caused by the length of the eyeball. In myopia, the eyeball is too long, causing light to focus in front of the retina. In hyperopia, the eyeball is too short, causing light to focus behind the retina.

Nearsightedness and Farsightedness Are Caused by the