I've heard of Nasal sarcoma spreading to the eye, and probably it's reasonable for oral cancer to spread in that direction. If the eye is open and draining you have limited options, as infection is a serious risk. You could consider having the eye removed, but not the jaw? While under they could take an ultrasound and see if there is other evidence of metastasis, that could be treated with Chemo afterwards. Good luck in your decision.