As our bodies age, the crystalline lens, the part of the eye that allows us to focus, becomes more rigid and less flexible. When this happens, we lose our ability to focus on small, near details like words and images close by, such as in books or on menus.
Most people first notice presbyopia around the age of 40. Presbyopia occurs in all people, regardless of other vision problems. Presbyopia is unavoidable. Most people treat it by wearing bifocals or reading glasses.
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