And, frankly, if you're really aggressively going under the chin, you can only barely manage a poke in the eye (at best), as you're pushing the eyes away from your own reach.You can reach but what are you going for. If you are working the palm under the chin. You fingers hace to go backwards. If you are working the fingers in the eyes. Then the palm goes backwards.
You are defending you own move by trying to do both at once.