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Vision is the sensory modality that permits the individual to perceive the environment in terms of brightness, color, orientation, and depth. The organ for vision is the eye, where the retina consists of two sensory cells called cones and rods. Cones permit high visual acuity and color perception. Rods are suited for vision in low-light conditions. The rods and cones detect the light it receives from the environment and indirectly transduce the information to neural action potentials. The neural information is then transferred to the brain for processing in the visual cortex of the opposite side.
The presence of two eyes provides binocular vision for depth perception. Leela in the "Futurama" animated series is a cyclops, having only one eye. As a result, her lack of depth perception is parodied in the cartoon.
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