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:
“A feeble man can see the farms that are fenced and tilled, the houses that are built. The strong man sees the possible houses and farms. His eye makes estates, as fast as the sun breeds clouds.”
—Ralph Waldo Emerson (1803–1882)
“The master’s eye is the best fertilizer.”
—Gaius Plinius Secondus (c. 23–79)
“The eye sees not itself
But by reflection.”
—William Shakespeare (1564–1616)