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Human eye, closed.

Eyes are organs that detect light. The simplest "eyes", in even unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms and may allow the organism to seek out or avoid light. More complex optical systems with resolving power have come in ten fundamentally different "designs", and 96% of animal species possess a complex optical system.

When a person is crying, tears come out of their eyes.

See also[edit]

Human eye, open.
Smallwikipedialogo.png This page uses content from Wikipedia. The original article was at Eye. The list of authors can be seen in the page history. As with Spanking Art, the text of Wikipedia is available under a copyleft license, the Creative Commons Attribution Sharealike license.