I don't think that's necessary - when the pupil moves, the whole eyeball rotates, but the light still passes through the center of the eyeball. So we can just that center in our geometry calculations. http://en.wikipedia.org/wiki/Human_eye#Extraocular_muscles
Possibly, we might want to track the pupil size, but it seems reasonable to assume it is always small, since glare is only an issue in bright light. Although, once the glare is hidden, the pupil would dilate slightly, so it's probably best to use that pupil size in the calculations.
If we wanted to cover the whole retina (not just the fovea), we'd need a much bigger blackspot. Actually, the ideal is not to have a sharply delineated spot, but a gradient, corresponding to the sensitivity of retina that it falls upon.
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I don't think that's necessary - when the pupil moves, the whole eyeball rotates, but the light still passes through the center of the eyeball. So we can just that center in our geometry calculations. http://en.wikipedia.org/wiki/Human_eye#Extraocular_muscles
Possibly, we might want to track the pupil size, but it seems reasonable to assume it is always small, since glare is only an issue in bright light. Although, once the glare is hidden, the pupil would dilate slightly, so it's probably best to use that pupil size in the calculations.
If we wanted to cover the whole retina (not just the fovea), we'd need a much bigger blackspot. Actually, the ideal is not to have a sharply delineated spot, but a gradient, corresponding to the sensitivity of retina that it falls upon.