I'm very sorry to hear about your son's eye alan.
If it were me, before going ahead with surgery to remove his eye, I would go somewhere else for a second opinion. You just never know.
I would probably do as campbell has suggested & contact Moorfields in London, although the consultant/s your son has already seen, may very well be as good as the consultants there.
Good luck to your son & take care.
P.S. My nephew had an accident with a sharp stick (playing around with a friend) when he was 12 years old & nearly lost his eye. They managed to save his sight, but a part of the Iris is now black instead of blue.