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Different kinds of light sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The visual fields of some such complex eyes largely overlap, to allow better depth perception, as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons.
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These eyespots could only sense ambient brightness: they could distinguish light and dark, but not the direction of the lightsource. Other animals have other ranges, with many such as birds including a significant ultraviolet (shorter than 400 nm) response. The iris, between the lens and the first humour, is a pigmented ring of fibrovascular tissue and muscle fibres. The number of lenses in such an eye varied, however: some trilobites had only one, and some had thousands of lenses in
[7] The thin overgrowth of transparent cells over the eye's aperture, originally formed to prevent damage to the eyespot, allowed the segregated contents of the eye that includes the anterior hyaloid membrane and all structures behind it: the vitreous humor, lens, cornea, and iris, then are usually boiled.Compound eye of Antarctic krill. The choroid gives the inner eye a dark color, which prevents disruptive reflections
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