The vet did stain the eye but I'm not certain she stained the entire eye- or just got it in the corner of the eye. He is not easy to medicate and was flinging his head away so while she got the stain in, I can't say if it was enough.
She did say to continue the antibiotic in case this is a corneal abrasion. She couldn't get a good look at the corners of the eye due to swelling. Corneal injuries need to be treated every 6 hours, which is why I'm not waiting 12 hours. I would rather give him extra antibiotic and not get an infection, than not give enough antibiotic.
In case anyone has a very difficult horse to medicate, hopefully these tips will help:
I finally figured out how to get the eye ointment in him. I put him in the horse trailer - backing him into the slant stall backwards. Then you tip his head towards you, and squirt it in the eye. My attempts in the stall, resulted in him rushing backwards, and flinging his head away. I tried cornering him in the paddock, but he just backs up around the tree, so that didn't work either. I tried tying him, and that only made him worse.
The vet held his eye open with one hand, while administering the medication in the other hand- while running after him as he scoots backwards. That didn't work too well because he doesn't want you holding his eye open with your hand.
I realized that it is much easier to just sit your hand on his face with the syringe- rest your hand near his eye and wait. Once he relaxes and stops head flinging, you can just give a squirt. If you are lucky and time it right, the medication goes right in. No more fighting. It helps to use a small syringe and not the vial the medication comes in. You want the medication under pressure so it will squirt out.
My last vet said to apply it with your finger, but that definitely does not work with him.