Ραγοειδής χιτώνας: Διαφορά μεταξύ των αναθεωρήσεων

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2. light absorption. The uvea improves the contrast of the retinal image by reducing reflected light within the eye (analogous to the black paint inside a camera), and also absorbs outside light transmitted through the sclera, which is by no means opaque.
 
In addition, some uveal regions have special functions of great importance, particularly secretion of the aqueous humour by the [[ciliary processes]], control of [[Accommodation reflex|accommodation]] (focus) by the ciliary body, and optimisation of retinal illumination by the iris's control over the [[pupil]]. Many of these functions are under the control of the [[autonomic nervous system]].
 
==Pharmacology==
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