Every color, every flash, every sunray exacts a toll on the light-sensitive tissues at the back of our eyes, producing toxic materials that risk damaging the very cells that allow us to see.
Thankfully, the pigment responsible for darkening our hair, skin, and eyes moonlights as a clean-up crew, mopping up one such dangerous compound before it accumulates into damaging clumps.
Lining the back wall of our eyeball's inner surface is a shag-pile rug of light-reactive cells called the. Every fiber in this carpet is packed with pancake-like stacks of discs containing a crucial substance that catches photons of light, starting a chain of reactions that results in a nervous impulse the brain interprets as sight.
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