Duplex retina
A duplex retina is a retina
The vertebrate retina is a light-sensitive tissue lining the inner surface of the eye. The optics of the eye create an image of the visual world on the retina, which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical...

 consisting of both rod cells and cone cells. In contrast to duplex retinas, pure rod and pure cone retinas have only rods or cones, respectively.
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