Visual Encyclopedia

Eye

Eyes are organs of the visual system. They provide organisms vision, the ability to process visual detail, as well as enabling several photo response functions that are independent of vision. Eyes detect light and convert it into electro-chemical impulses in neurons. 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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Contributed by Jordan Griffin

Beautiful Eyes

What an amazing eye color! They're blue with an explosion of yellow. Do you know anyone with eyes like this?

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Contributed by Violetta Gir

This is so interesting. This man has created models to illustrate how the human eye would have evolved from a patch of light-sensitive cells.

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Hazel eye by Sanbrina Campagna

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Cocaine as Anesthesia??

In the late 1800's ophthalmologist Carl Koller used liquid cocaine as anesthesia for eye surgery. He would place a few drops in the eyeball, which would temporarily immobilize and render it insensitive to pain.

Contributed by Taylor Jackson

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