So sorry that this happen to you and your little frog. Despite our best intentions and no matter how careful we are, accidents will happen so try not to be too hard on yourself.

I've no advice to give on the healing, but I will tell you that I've seen a few frogs in the wild that appeared blind in one eye and a couple with missing eyes. Yours has the advantage of a loving owner to give it medical care and a predator free environment. As you've also discovered, he is also willing to carry on his usual daily activities and not huddle in a corner sulking or carrying a grudge, so I'd say the outlook is hopeful. Best of luck!