That's a very vague questions, and of course you know I would need to actually see the scars. Here are some possibilities off the top of my head: severe dry eyes, eyelashes scratching eyes, map dot fingerprint dystrophy, herpes simplex keratitis, herpes zoster keratitis, staph marginal disease, atopic keratoconjunctivitis, chemical burn, foreign body injury, corneal ulcer, and on and on.......
If you and your doctor have not been able figure it out I would put the past behind you and focus on how you can best keep the eyes healthy and seeing well for many years to come.
MJK MD