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Increase in optical power by the eye in order to maintain a clear image (focus) as objects are moved closer. Occurs through a process of ciliary muscle contraction and zonular relaxation that causes the elastic-like lens to "round up" and increase its optical power. Natural loss of accommodation with increasing age is called presbyopia.


Dimness of vision, especially when occurring in one eye without apparent physical defect or disease. Also called lazy eye.


A refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina.

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