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:
““Why cannot the ear be closed to its own destruction?
Or the glistening eye to the poison of a smile?”
—William Blake (1757–1827)
“Among twenty snowy mountains
The only moving thing
Was the eye of the blackbird.”
—Wallace Stevens (1879–1955)
“Those who wander in the world avowedly and purposely in pursuit of happiness, who view every scene of present joy with an eye to what may succeed, certainly are more liable to disappointment, misfortune and unhappiness, than those who give up their fate to chance and take the goods and evils of fortune as they come, without making happiness their study, or misery their foresight.”
—Frances Burney (1752–1840)