
The expert opthalmologist at the game fair is a very experienced veterinary eye expert. He does this test on a daily basis to hundreds of dogs, so he knows what he is looking at. I also know the examiner in question is the only vet to have won awards for his work, which aids human patients. He won the David Cole Travel Fellowship which is normally only awarded to human doctors, he is also the expert for the Guide Dogs for the Blind Association.
Other panellists will not see that amount of dogs privately over the course of a year, so it might take them longer. If you have doubts about the test, you can appeal and go to another pannellist, but this means you have to do this with in 28 days.