Glossary
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| Term | Definition |
|---|---|
Accommodation |
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. |
Amyblopia |
Dimness of vision, especially when occurring in one eye without apparent physical defect or disease. Also called lazy eye. |
Astigmatism |
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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