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:
“For what but eye and ear silence the mind
With the minute particulars of mankind?”
—William Butler Yeats (1865–1939)
“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)
“We have no prairies
To slice a big sun at evening—
Everywhere the eye concedes to
Encroaching horizon,
Is wooed into the cyclops’ eye
Of a tarn.”
—Seamus Heaney (b. 1939)