The Parent of a Child Diagnosed as Having Astigmatism Asks

The parent of a child diagnosed as having astigmatism asks the school nurse to explain what the eye doctor meant by astigmatism. Which of the following responses by the nurse would best describe astigmatism?

A) The eyeball is too long, causing light rays to focus in front of the retina.
B) The eyeball is too short, causing light rays to focus in back of the retina.
C) The cornea or lens has uneven curvature, so the light rays don't focus correctly on the retina.
D) There is loss of vision in one eye, or more commonly, a reduction of vision in one eye.