This would be rather annoying for me as I cannot wink with my right eye (only my left, apparently not uncommon[0]). I suppose blinking would do the trick though.
If the sensor is only on the right side I guess it won't be able to detect actions from the left eye.
My first thought is with timing or counting winks. "Three fast winks" = "Take Picture".
or just unusally longer twinks
How do people manage to actively avoid the spell check in their browser or do people just ignore all the red squigglies?