Video: What is Presbyopia and Iris Constriction?

Get the scoop on why aging is often associated with worsening vision.

The eye's lens, with its ability to curve and focus, allows you to see objects clearly.  As you age, the lens often becomes less flexible and unable to curve, making nearby objects appear blurry.  This is called presbyopia.  Age also causes the muscles of the iris to weaken and therefore respond poorly to changes in light.  The result is iris constriction, or difficulty seeing in dim light.  Watch this video to discover more about your age-related vision problems.

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