You notice that your father holds his book farther from his face than he used to. Since you are taking an anatomy and physiology course, you realize that this is due to

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The ability of the lens to change its shape, or accommodate, for near or far vision is gradually lost with age. This condition is called presbyopia. As a result, people will hold objects, such as books or phones, farther away in order to see them more clearly. Cataracts, a lack of vitreous humor, or a tumor on the optic nerve would likely cause other visual symptoms in addition to difficulty focusing on near objects. Photoreceptor sensitivity also typically diminishes with age, but would not cause specifically difficulty with close-up vision.

You Notice That Your Father Holds His Book Farther from His