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:
“When he became all eye when one was present, and all memory when one was gone; when the youth becomes the watcher of windows, and studious of a glove, a veil, a ribbon, or the wheels of a carriage, when no place is too solitary, and none too silent.”
—Ralph Waldo Emerson (1803–1882)
““Why cannot the ear be closed to its own destruction?
Or the glistening eye to the poison of a smile?”
—William Blake (1757–1827)
“Passing away, saith the World, passing away:
Chances, beauty and youth sapped day by day:
Thy life never continueth in one stay.
Is the eye waxen dim, is the dark hair changing to gray
That hath won neither laurel nor bay?”
—Christina Georgina Rossetti (1830–1894)