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Eyes are the organs of vision. They 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.
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Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical
system.[1] Image-resolving eyes are present in molluscs, chordates and arthropods.[2]
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