The retina is composed of nerve tissue. This tissue senses the entrance of light into the eye. This tissue contains photoreceptors in the shape of cones and rods.
The cones sense colors, while the rods identify shades and shapes. When the lens focuses the light upon the retina, it first goes past the photorecptors which are facing the opposite way. The light is then reflected back to the cones and rods. This information is then transported to the brain. The center of the retina is known as the macula. This is where the cones are located.
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