We see through the process of light being transmitted through the eye to the retina, which converts...
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We see through the process of light being transmitted through the eye to the retina, which converts light into electrical impulses that are sent to the brain. One part of the eye that changes with age and affects vision is the lens. Along with the cornea, the lens helps to bend light to be focused on the retina. It changes shape so that images of objects at different distances are transmitted clearly. As we get older, the lens becomes less flexible and it becomes harder to focus clearly on close objects. This is called presbyopia. This process may occur earlier in people who are already farsighted. People who are nearsighted may be able to see close objects clearly without their glasses, but experience blurry vision when wearing lenses for distance. The easiest way to correct presbyopia is with glasses. People who already wear glasses for distance vision may need another pair of glasses for close vision. Bifocals and progressive lenses correct both distance and close up vision. People who wear contact lenses for distance vision may also need reading glasses or they may use two monovision lenses, that is, one contact lens for distance vision and the other for close-up vision. There are also surgical treatments for presbyopia. Options include reshaping the cornea with a laser or low energy radio waves, and implantation of a replacement lens.
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