The human eye is an organ that allows vision. The eyeball is the part of the eye where light enters and images are formed on the retina. The optic nerve carries impulses from the retina to the brain. The lens focuses light onto the retina, which converts it into neural signals known as electro-chemical nerve impulses (action potentials). These action potentials travel along neurons of the optic nerve until they reach their destination in your brain's visual cortex (where they give rise to vision).
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| Human Eye |