Interestingly, a genetic mutation thought to have occurred between 6,000 and 10,000 years ago is the origin of this eye color.
One possible explanation for the difference in the appearance of gray and blue eyes is that gray eyes have larger deposits of in the stroma, so that the light that is reflected from the epithelium undergoes which is not strongly frequency-dependent rather than Rayleigh scattering in which shorter wavelengths of light are scattered more.
However, this process isn't like glow-in-the-dark technology.
Humans and other animals have many variations in eye color.
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