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A crystalline structure responsible for focusing light onto the retina. It changes shape slightly to allow us to change focus between objects that are near and those that are far in a younger person. In an older person, it may not be adjustable. In this case, reading glasses or bifocals may be used.

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The EyeCyclopedia is a collection of eye care terminology created by practicing optometrists and ophthalmologists. The information provided is not intended to be a substitute for regular medical care or to diagnose or treat any medical condition, and should be used only as a supplemental source of information. Please consult your doctor if you have any questions or concerns about your eye health.
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