Eye
Eyes are organs that detect light and convert it into electro-chemical impulses in neurons. The simplest photoreceptor cells in conscious vision connect light to movement. In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods.
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Famous quotes containing the word eye:
“He gives the impression of a strong mind which is composed and wise. His brown eye is exceedingly kindly and gentle. A child would like to sit in his lap and a dog would sidle up to him. It is difficult to associate his personality and this impression of kindness and gentle simplicity with what has occurred here in connection with these purges and shootings of the Red Army generals, and so forth.”
—Joseph Davies (1876–1958)
“The eye is the lamp of the body.”
—Bible: New Testament, Matthew 6:22.
“Nature seems to have taken a particular Care to disseminate her Blessings among the different Regions of the World, with an Eye to this mutual Intercourse and Traffick among Mankind, that the Natives of the several Parts of the Globe might have a kind of Dependance [sic] upon one another, and be united together by their common Interest.”
—Joseph Addison (1672–1719)