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Presbyopia
0:35
YouTubeEyeSmart — American Academy of Ophthalmology
Presbyopia
The eye's ciliary muscle contracts, causing the eye's natural lens to thicken or change shape, which allows us to see objects up close. Presbyopia develops as we age, when our lens becomes less flexible and resists changing shape. With presbyopia, up-close focusing becomes more difficult. Learn more at http://www.geteyesmart.org.
121.3K viewsDec 3, 2010
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