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)
“A squirrel leaping from bough to bough, and making the wood but one wide tree for his pleasure, fills the eye not less than a lion,—is beautiful, self-sufficing, and stands then and there for nature.”
—Ralph Waldo Emerson (1803–1882)
“The chief imagination of Christendom,
Dante Alighieri, so utterly found himself
That he has made that hollow face of his
More plain to the mind’s eye than any face
But that of Christ.”
—William Butler Yeats (1865–1939)