Mr. Barnes is a 64-year-old house painter who is seeing his health care provider for his annual check-up. When the nurse asks him if he has had any problems, he tells her that he doesn't think his vision is as good as it used to be
He states that "things look more yellow than they used to." She knows that this is a visual change in older adults because the: A. iris yellows.
B. lens yellows.
C. pupils take longer to dilate.
D. pupils take longer to constrict.
B
Visual changes often include reduced visual fields, increased glare sensitivity, impaired night vision, reduced accommodation, reduced depth perception, and reduced color discrimination. Many of these symptoms occur because the pupils in the older adult take longer to dilate and constrict secondary to weaker iris muscles. Color vision decreases because the retina is duller and the lens yellows.
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