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Originally posted by Th0r
Greys have black eyes becasue there a different species.
Originally posted by K_OS
The skin tone and large black eyes would put them farther from their star. Larger pupils needed to gather more light.
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K_OS
Another possibility is that they have eyes that are biologically vastly different from ours (perhaps through genetic enhancement) and can see into the infrared and ultraviolet spectra.