Thanks everyone for the well-wishes! Jackson's doing okay - still blinking a bit, so I know the eye's still hurting. His Metacam is helping keep the swelling and pain under control, and he's really good when I apply the Mycitracin eye ointment every eight hours. He's tolerating the cone pretty well, and he even figured out how to drink with it on today - yay! I still had to take if off for him to eat. Otherwise, he's wearing it 24/7. I can't afford for him to further damage his eye by rubbing it. I found out that eye ulcers, especially in boxers (and other smush-faced breeds) are notorious for their propensity for slow healing.
Pops and Calvin, Jackson truly appreciates your support, he really does, but I respectfully decline joining him in wearing a cone. I think I'm suffering enough, paying his vet bill - lol!