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 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)
“Stars, hide your fires;
Let not light see my black and deep desires!
The eye wink at the hand; yet let that be
Which the eye fears, when it is done, to see.”
—William Shakespeare (1564–1616)
“The eye is the best of artists.”
—Ralph Waldo Emerson (1803–1882)