My husband is a vet tech and the vets that work there work with a veterinary ophthalmologist sometimes! He went to vet school, I don't remember what all else he did but that's what he does now. I had to take my cat in for an eye infection and they used the tonopen on her, and did direct for a second. it was cute, (and EXPENSIVE) lol. He has a veterinary eye exam book in his office.. I think it's kind of interesting!