https://www.theverge.com/circuitbreaker/2017/9/14/16308748/face-id-iphone-x-sunglasses-quick-disable-cop-button-craig-federighi

A couple more questions have been answered about the iPhone X’s Face ID feature, confirming that the function will still work even when wearing most sunglasses, and that users will be able to quickly disable the unlocking feature to get mitigate against thieves. The news come straight from Apple’s Senior Vice President of Software Engineering Craig Federighi responding to an email sent by Keith Krimbel, via MacRumors.

E-mailed #CraigFederighi about #FaceID and actually got a response! pic.twitter.com/3Ytt1k6WvK