Κόρη (ανατομία): Διαφορά μεταξύ των αναθεωρήσεων

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In [[humans]] and many [[animal]]s (but few [[fish]]), the size of the pupil is controlled by involuntary constriction and dilation of the [[iris (anatomy)|iris]] in order to regulate the intensity of [[light]] entering the eye. This is known as the [[pupillary reflex]]. In normal room light, a healthy human pupil has a diameter of about 3-4 millimeters, in bright light, the pupil has a diameter of about 1.5 millimeters, and in dim light the diameter is enlarged to about 8 millimeters.

 

When an eye is [[photograph]]ed with a [[Flash (photo)|flash]], the iris cannot close the pupil fast enough and the blood-rich [[retina]] is illuminated, resulting in the [[red-eye effect]].

 

[[Image:The number of the beast.jpg|thumb|The pupils of [[sheep]] and [[goat]]s are horizontal almost rectangular ovals.]]

When bright light is shone on the eye, it will automatically constrict. This is the [[pupillary reflex]], which is an important test of [[brainstem]] function. Furthermore, the pupil will dilate if a person sees an object of interest.

 

 

 

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