hi. my dad had retina tear and he just had a laser surgery. i remember the doctor asked him not to bend his head down. my dad was stubborn. he insisted to drive all our way home. and this morning he said some of the floaters have accumulated together as a clump. he then did his chores and bent his head down MANY MANY times. after i burnt the incense ( we are chinese ) , he complaint that his eye felt itchy. so doctor, is it because what he had done causes this? or is it because the incense? thanks =)