What causes nearsightedness, farsightedness, and astigmatism?
A) The blind spot is abnormally large or small.
B) Incoming light signals are not properly focused on the retina.
C) The iris and cornea do not function properly.
D) Accommodation does not take place.

Question

Quizplus · Accepted Answer

Nearsightedness (myopia) occurs when the eyeball is too elongated or the cornea is too curved, causing light to focus in front of the retina instead of on it. Farsightedness (hyperopia) occurs when the eyeball is too short or the cornea is too flat, causing light to focus behind the retina instead of on it. Astigmatism occurs when the cornea is curved irregularly, causing multiple points of focus instead of a single point. All of these conditions result in incoming light signals not being properly focused on the retina.

What Causes Nearsightedness, Farsightedness, and Astigmatism