Presbyopia affects everyone. Throughout our lives we gradually lose our ability to focus up close. Young children can focus on objects just a couple inches from their face. Teenagers can read something a few inches from their nose. College students see clearly at less than a foot away. By forty years of age, however, books must be held farther back to be read comfortably. The eyes didn’t suddenly go bad at forty. The eye had been gradually losing the ability to focus since birth due to growth of the lens inside the eye and a resulting loss in flexibility.

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