i have always worn a 3/4 facemask and have transition lenses in my glasses and on bright, sunny days they almost get too dark. so no chance of turkeys seeing my blue and sometimes bloodshot eyes
but, last fall i busted a flock of toms walkin in, set up, waited and called. 15 minutes later heard one walking toward me from behind. he stepped out to my right and stopped 5 yards away.
i shoot righthanded but with the brush i had no shot anyway. but when i turned my eyes only to look for a shooting lane where i thought the tom would walk out into the field, he took off like the space shuttle. the only thing that could have spooked him was my eye movement.