View-through sensors and apparatuses for tracking eye movement, and methods and software therefor

An apparatus for tracking eye movement of a subject eye of a user, wherein the subject eye has a pupil and an exterior, the apparatus comprising:

• a support structure;
• a view-through sensor secured to the support structure for tracking eye movement via light reflected from the exterior of the eye when the user is wearing the support structure, the view-through sensor having:
• a view-through region that allows the user to see through the view-through sensor substantially unobstructed during use of the apparatus;
• and
• a peripheral active device region adjacent to the view-through region and at least partially surrounding the view-through region, the peripheral active device region containing a first plurality of light-sensing regions distributed around the view-through region and be operative, separately from one another, to sense intensity of light reflecting off of the exterior of the subject eye and striking the first plurality of light-sensing regions while the user is looking through the view-through region;
• and
• a processor, and machine-executable instructions that, when executed by the processor, execute a gaze-inference algorithm that determines a location of the pupil of the subject eye as a function of light-intensity readings made from the first plurality of light-sensing regions while the user is looking through the view-through region and based on light passing through the pupil into the subject eye and absorbed within the subject eye.