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The eye has evolved independently, and in different forms, on many occasions in the animal kingdomNeeds citation. Some people find this incredible.Needs citation
The eye is the sensory organ of sight. Having paired eyes confers binocular vision, which allows the perception of distance and depth.
Human eyes can perceive shape, form, colour, movement, shadow and many subtle variations of the above. The eyes are innervated by the optic nerve (cranial II), which conveys sensory impulses from the retina along the visual pathway to the visual cortex in the occipital lobes of the brain.
The medical specialty which concerns diseases of the eye is ophthalmology.
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