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:
“Bias and impartiality is in the eye of the beholder.”
—Lord Barnett (b. 1923)
“The jargon of these sculptors is beyond me. I do not know precisely why I admire a green granite female, apparently pregnant monster with one eye going around a square corner.”
—Ezra Pound (1885–1972)
“The giant was hairy, the giant was horrid,
He had one eye in the middle of his forehead.”
—Ogden Nash (1902–1971)