Hi. I'm online and happy to answer your question today.
Well, the only place to go for a second opinion when you are the "only person in the world with this condition" is to a very large University Teaching Hospital. They love to evaluate, treat and publish all about interesting cases.
The other option, of course, is to be happy that the glasses work for him and not worry about it.
In your son's case I would further suggest that he not go to just any large university teaching hospital but to one few "cutting edge" University Eye Centers.
Where would I suggest? Wills Eye Hospital in Philadelphia, The Mayo Clinic in Rochester , Mn, Bascom Palmer in Miami UCSF in San Francisco or Johns Hopkins in Baltimore.
At an institution like that you could be evaluated and treated by a team of sub-specialists who are at the cutting edge of their respective fields. The best thing about these large teaching hospitals is that consultations are available with Professors and leaders in their field by just walking a few steps down the hall.
We have been experiencing problems with the chat system for the last few days. Our engineers are working on it. However, I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)