What is the effect of aging on the eye in relation to focusing?

As individuals age, one common effect on the eye is the development of presbyopia, which is a condition that leads to difficulty in focusing on close objects. This occurs due to the hardening of the lens inside the eye, which diminishes its ability to change shape and thus accommodate adequately for near vision tasks. As the lens becomes less flexible, people often experience strain or discomfort when attempting to focus on nearby objects, such as reading or working on a computer. This strain can lead to symptoms like eye fatigue or headaches.

The other options do not accurately represent typical age-related changes in vision. For instance, depth perception may remain stable or even improve in certain conditions, while clarity of vision often deteriorates due to factors like cataracts or other age-related changes. Light sensitivity can also increase rather than decrease as the pupil becomes less responsive, and other changes in the eye complicate light processing. Overall, focusing ability is particularly impacted by aging, making the assertion regarding strain when focusing on near objects the most accurate choice.