Eye tracking using time multiplexing

An eye-tracking system associated with a head-mounted display (HMD) comprising:

• a source assembly that includes at least a first set of light sources and a second set of light sources that are both configured to emit light towards an eye of a user of the HMD in accordance with a set of emission instructions, wherein the first set of light sources is configured to emit a first light pattern over a first time period and the second set of light sources is configured to emit a second light pattern over a second time period;
• a camera assembly configured to capture images of a cornea of the eye over at least the first and second time periods in accordance with a set of imaging instructions;
• and
• a controller in communication with the source assembly and the camera assembly, and configured to:
• using the captured images, identify a plurality of glints comprising at least one or more glints associated with the first light pattern and one or more glints associated with the second light pattern;
• and
• determine an orientation of the eye based upon the plurality of identified glints and an eye model associated with a particular cornea shape.