Ken
In reply to your e-mail about me and RP. I was born with RP at an advanced stage. I had declineing vision until the age of 30. I have been without sight about 33 years, now. Dr. Burson of Mass. General in Boston conducted a Double blind study a few years ago. They found high dose's of vitiuam A had an effect of slowing down the progress of RP. Specialest before starting this treatment. You should contact a Retinia I have had a RP support group. If you would like to continue to e-mail me or if I can help you understand your Son's Eye disease please let me know. You Friend, Ken