OP, watch that eye carefully several times a day. It might be a good idea to take photos regularly, too.
A scratch, abrasion or other insult to the cornea is quite painful. When the immune system kicks in to help heal, it can produce substances that can affect healthy cells.
I had a horse with a simple scrape on the cornea, which became an ulcer. In a matter of four hours it became a melting ulcer—a true vet emergency, straight to the clinic to see the veterinary opthamologist.
One thing that helped immensely for treatment was a subpalpral lavage system. A tiny tube was placed thru the upper eyelid, stitched into place, and the tube was secured in the mane. No more trying to pry open eyelids (more pain!), and meds could be administered every 2-3 hours. Antibiotics, atropine (to dilate the pupil, relieving some pain), and some of her own serum spun down from her blood all helped the healing process. All with easy cooperation from the patient!
My horse had an excellent outcome, no visual deficit, and only a tiny speck (scar) if you knew where to look in the eye. I hope your is much less eventful!