Has anybody ever dealt with an eye injury with their horse?

I never in my years with horses have dealt with an eye injury. My mare started tearing up about about two weeks ago and her eye would run. I thought perhaps allergies, and she didn't seem to be in pain, so I didn't think much of it. But it continued, so today I had the vet out to look at her.

She has an ulcer on her eye and has to take both a pill and and have cream in her eye 4 times a day. She still has sight in the eye and the vet seems to think she'll be okay and we caught it early, but I guess I just want some reassurance an ulcer will clear up with proper care and be fine. I feel really bad that I didn't recognize it as an injury at first and wasted time having a vet look at her. If anybody else has dealt with eye injuries in horses or knows of a good resource in which to get information, I'd appreciate it. Thank you.
Answers:
I have had this happen twice to two different horses over the years and yes it should clear up and been fine. The biggest thing is getting the cream in the eye properly. And you almost have to call the vet since the cream is an antibiotic that they prescribe. And most want to see the animal before handing out the meds. So you did everything just right.