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So it will not work with sunglasses? FAIL if true.

They said it works if you are wearing glasses, so it will probably also work with sunglasses

Glasses are much more see-thru than sunglasses and therefore it may work with glasses but not sunglasses

This doesn't use visible light - it's IR.

A lot of IR is blocked by sunglasses. I know my IR iris scanner on my S8+ rarely works through sunglasses.