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In addition, you also have to have your eyes open for the phone to unlock.

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.