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Structure of the eye, illustration
Most of the light (yellow arrow) in the visual spectrum first passes through the cornea (clear front layer of the eye) and then the pupil. This light is focussed by the lens together with the cornea, onto the retina at the back of the eye. In the retina, photoreceptor cells called rods and cones convert the light into electrical signals. The visual cortex is the area of the cerebral cortex that receives and processes visual information. Blue light (blue arrows) is captured through the ganglia with melanopsin (ipRCG) and the signal goes to the optical nerve. For a labelled version of this image, please see C056/3090., by JOSE ANTONIO PEÃ 'AS/SCIENCE PHOTO LIBRARY
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