Patent ID: 8909311

Claim:
A contact lens, comprising: a substrate that forms at least part of a body of the contact lens; and a pulse oximetry sensor located on or within the substrate configured to detect information associated with at least one of a blood oxygen content or a pulse rate of a wearer of the contact lens, the pulse oximetry sensor comprising: one or more light emitting diodes configured to illuminate a blood vessel of at least one of a region of an eye or an eyelid; and a detector configured to receive light transmitted through the blood vessel and generate the information, wherein the information includes a signal indicating an amount of light transmitted through the blood vessel; wherein the one or more light emitting diodes and the detector are positioned away from a center of the contact lens; the contact lens configured to maintain an orientation when worn on an eye such that the one or more light emitting diodes and the detector are not covered by an eyelid when the eye is open.