What stops a racer from taking a pair of dark sunglasses (or mirrored) and doing a little "duct tape magic" on the inside where the NHRA gods can't see? If you only put them on just before staging, only did one lens and closed your other eye once you saw the tree start, it would be safe and "big brother" would never be the wiser.

Back before the LED's I used sunglasses to slow my R/T, and for the night races, they came off briskly before the 1-2 shift, one fluid motion from reacting to the tree to grabbing the frames, then off to the shifter......food for thought.
EDIT: I just read Pat's thread on patented glasses, rats, someone had the idea before me!!