The vet has been through several treatments - first time there was no sign of corneal damage so drops, second time they suggested hay fever and antihistamine , third visit they detected a corneal ulcer and he is now on various types of serum, drops and painkillers. We have another check up tomorrow . Vet says she doesn't know what has caused it - could be bacterial , has mentioned herpes. Should I be asking for a referral to a specialist eye hospital?