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.
C
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A Incorrect. Myopia (nearsightedness) occurs then the eyeball is too long, causing light rays to focus in front of the retina.
B Incorrect. Hyperopia (farsightedness) occurs then the eyeball is too short, causing light rays to focus in back of the retina.
C Correct. Astigmatism (blurred vision) occurs then there is uneven curvature of the cornea or lens, so the light rays don't focus correctly on the retina.
D Incorrect. Astigmatism is not described as loss of vision in one eye, or more commonly, a reduction of vision in one eye.
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