Eye

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This article is about the organ. For the human eye, see Human eye (Abre numa nova janela). For the letter, see I (Abre numa nova janela). For other uses, see Eye (disambiguation) (Abre numa nova janela).

"Eyeball", "Eyes", and "Ocular" redirect here. For other uses, see Eyeball (disambiguation) (Abre numa nova janela), Eyes (disambiguation) (Abre numa nova janela), and Ocular (disambiguation) (Abre numa nova janela).

Eye

A human eye (Abre numa nova janela)

Compound eye (Abre numa nova janela) of an Antarctic krill (Abre numa nova janela)

DetailsSystem (Abre numa nova janela)Nervous (Abre numa nova janela)IdentifiersLatin (Abre numa nova janela)OculusMeSH (Abre numa nova janela)D005123 (Abre numa nova janela)TA98 (Abre numa nova janela)A15.2.00.001 (Abre numa nova janela)
A01.1.00.007 (Abre numa nova janela)TA2 (Abre numa nova janela)113 (Abre numa nova janela), 6734 (Abre numa nova janela)FMA (Abre numa nova janela)54448 (Abre numa nova janela)Anatomical terminology (Abre numa nova janela)

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Eyes are organs (Abre numa nova janela) of the visual system (Abre numa nova janela). They provide animals with vision (Abre numa nova janela), the ability to receive and process visual detail, as well as enabling several photo response functions that are independent of vision. Eyes detect light (Abre numa nova janela) and convert it into electro-chemical impulses in neurons (Abre numa nova janela). In higher organisms, the eye is a complex optical (Abre numa nova janela) system which collects light from the surrounding environment, regulates its intensity through a diaphragm (Abre numa nova janela), focuses (Abre numa nova janela) it through an adjustable assembly of lenses (Abre numa nova janela) to form an image (Abre numa nova janela), converts this image into a set of electrical signals, and transmits these signals to the brain (Abre numa nova janela) through complex neural pathways that connect the eye via the optic nerve (Abre numa nova janela) to the visual cortex (Abre numa nova janela) and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal (Abre numa nova janela) species possess a complex optical system.[1] (Abre numa nova janela) Image-resolving eyes are present in molluscs (Abre numa nova janela), chordates (Abre numa nova janela) and arthropods (Abre numa nova janela).[2] (Abre numa nova janela)

The most simple eyes, pit eyes, are eye-spots which may be set into a pit to reduce the angles of light that enters and affects the eye-spot, to allow the organism to deduce the angle of incoming light.[1] (Abre numa nova janela) From more complex eyes, retinal photosensitive ganglion cells (Abre numa nova janela) send signals along the retinohypothalamic tract (Abre numa nova janela) to the suprachiasmatic nuclei (Abre numa nova janela) to effect circadian adjustment and to the pretectal area (Abre numa nova janela) to control the pu (Abre numa nova janela)