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Message definition (The Eye and Retina )
==== The Iris and the Pupil====
==== The Iris and the Pupil====
[[File:Eye dilate.gif|right|300px]]
The iris is the part of the eye located between the cornea and the lens. In the center of the iris is the pupil, which is an aperture that allows the light to enter the eye. The iris' muscles constrict the pupil when exposed to bright light, and dilate it when exposed to dim light. Melanin levels are one of the most prominent factors responsible for the color of the iris. When melanin is relatively absent, the iris will likely be blue or green, while when there is a lot of melanin, the iris will be more likely to appear brown or black. <ref>"iris." Encyclopaedia Britannica. Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc., 2014. Web. 16 Jun. 2014. http://www.britannica.com/EBchecked/topic/294031/iris</ref> Translation ==== El iris y la pupila ==== El iris y la pupila
El iris es la zona del ojo entre la córnea y el cristalino. En el centro se encuentra la pupila, una apertura que permite la entrada de luz. Los músculos del iris contraen el iris ante luz brillante y lo dilatan en condiciones de poca luz. La concentración de melanina es el factor preponderante que define el color del iris. En la ausencia relativa de melanina, el color del iris suele ser azul o verde. Por otra parte, con mayor cantidad de melanina, es más probable que el iris sea café o negro.
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↑ "iris." Encyclopaedia Britannica. Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc., 2014. Web. 16 Jun. 2014.
