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:
“Roast Beef, Medium, is not only a food. It is a philosophy. Seated at Life’s Dining Table, with the menu of Morals before you, your eye wanders a bit over the entrées, the hors d’oeuvres, and the things à la though you know that Roast Beef, Medium, is safe and sane, and sure.”
—Edna Ferber (1887–1968)
“The gap between the committed and the indifferent is a Sahara whose faint trails, followed by the mind’s eye only, fade out in sand.”
—Nadine Gordimer (b. 1923)
“Power lasts ten years; influence not more than a hundred.”
—Korean proverb, quoted in Alan L. Mackay, The Harvest of a Quiet Eye (1977)