A 64-year-old house painter who is seeing his health care provider for his annual checkup.When the nurse asks the patient if they have any health concerns,the patient states,"I don't think my vision is as good as it used to be,things look more yellow than they used to." The nurse knows that this is a visual change in older adults caused by which of the following?

A) Iris yellows
B) Lens yellows
C) Retina is hypersensitive
D) Need for less light to see than when they were in young adulthood

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.Eventually,older adults may require three times as much light to see things as they did when they were in young adulthood.