When people get older the lens becomes stiffer and is not able to change shape as readily as when people are younger. Why would the inability of changing the angle of light through the lens cause objects (particularly those that are close) to become out of focus?

Question

Quizplus · Accepted Answer

The Answer is The lens helps focus light on the back of the retina. If the lens cannot change shape, light will not be focused on the back of the retina and the image will be out of focus. Reading glasses help change the focal length to refocus the image on the retina.

When People Get Older the Lens Becomes Stiffer and Is