Lol, every face is hard to be "seen" by cameras in night, no matter the skin color. Anyway, these biometric cameras use infrared light, if I'm not mistaken, so all the facial features would be visible and I don't think skin color would influence operation of the sensor in any way.
And if it's not infrared, then I guess the frontal screen flash would go off.
Either way, I am 100% certain that Apple would NEVER introduce any biometric solution that works better with a specific race, gender or any other physical attribute.
Primesense technology is ir or near-ir.
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