An older man tells a nurse, "The doctor says I have something wrong with my eyes, something called presbyopia. Can you explain why I have this? I was always fortunate to have good eye-sight." The nurse formulates a response based on the knowledge that:
a. the lens of the eye loses elasticity causing a loss of focus for near objects.
b. the cornea of the eye becomes thicker and less curved causing an increase in astigma-tism.
c. the lens of the eye increases in opacity causing a decrease in light refraction.
d. the cornea of the eye forms a gray ring at the edges.
ANS: A
Presbyopia is the loss of focus for near objects, caused by a loss of elasticity and hence a loss of accommodation of the lens of the eye. All of the other options are normal age-related changes; however, they are not related to presbyopia.
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