Which is not a disease that can affect an older adult's eyesight?
a. Glaucoma
b. Presbyopia
c. Cataract
d. Macular degeneration
B
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A Incorrect. Glaucoma, a disease marked by increased pressure within the eye that potentially leads to optic nerve damage, is the most common cause of blindness after age 65
B Correct. Presbyopia, a gradual decline in the flexibility of the lens, makes close-up focusing more difficult and is a common age-related change, but not a disease.
C Incorrect. A cataract is a disease marked by clouding and blurring of the lens.
D Incorrect. Macular degeneration is a disease characterized by damage to the central part of the retina that leaves the outer edges of the visual field intact.
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