This image captures the many layers of nerve cells in the retina. The top (green) layer is made up of cells called photoreceptors that convert light into electrical signals to send to the brain. The two most well-known types of photoreceptor cells are rod-shaped and cone-shaped. Rods help us see in low light conditions, but can and

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Photo credit: © NIH / IMAGE POINT FR / BSIP / Alamy / Afripics
License: Licensed
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