US Patent 8963806 Device authentication

A head-mountable device configured to authenticate a wearer is disclosed. The head-mountable device can receive an indication of an eye gesture from at least one proximity sensor in the head-mountable device configured to generate sensor data indicative of light reflected from an eye area. The head-mountable device can capture biometric information indicative of one or more biometric identifiers of a wearer of the head-mountable device responsive to receiving the indication of the eye gesture. The head-mountable device can authenticate the wearer of the head-mountable device based on a comparison of the captured biometric information and a stored biometric profile.