Online Eye-tracking
Options are somewhat limited, but it is possible to do some eye-tracking via webcam.
LabVanced Webcam Eye-tracker
LabVanced offers a state-of-the-art webcam eye-tracking algorithm that accounts for head movement, blinks, lighting, and other important elements. It is top of the line (or nearly) and included in our lab's license for the platform. For information on the webcam eye-tracker, see this link:
Of course, online webcam eye-tracking will never be as good as head-stabilized or infrared eye-tracking, but whilst we cannot access the lab (or for hard-to-reach participants), it is an excellent alternative.
Other resources
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