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:
“The genius is a genius by the first look he casts on any object. Is his eye creative? Does he not rest in angles and colors, but beholds the design,—he will presently undervalue the actual object.”
—Ralph Waldo Emerson (1803–1882)
“Democritus plucked his eye out because he could not look at a woman without thinking of her as a woman. If he had read a few of our novels, he would have torn himself to pieces.”
—Wallace Stevens (1879–1955)
“... it is easier for a camel to pass through the needle’s eye than for anything really chic to enter the Kingdom of Heaven.”
—Katharine Fullerton Gerould (1879–1944)