First of all, I'm really sorry about your condition. I also have to say I read this post from time to time... we all start to get reckless eventually and this serves as a good reminder not to.
I'll give you my 2 cents on the stem cell therapy. Please understand that I absolutely don't want to take away your hopes, on the contrary - I want to make sure you make an informed decision before doing this.
I'm no expert and I have done no research on the subject but a few things about that treatment have tickled my mistrust:
-A few months before you said they gave you a price for a treatment without having seen the specifics of your case. It shouldn't go like this, specially for an "experimental" treatment. They should have made a personal appointment to examine you, analyse your case and determine not only the price but IF the treatment would be appropriate nd HOW it would be done. When working with something new you don't just pull a generic, pre-cooked answer up your sleeve.
-The fact they don't DEMAND medium/long term follow-ups. How the hell do they know their treatments are being successful? What if something goes wrong (and it could - biology isn't math), how are they gonna find out early and fix it? Let me give you an example - my mom did refractive surgery, which is an "old", well understood technology and she still had to return to the doctor a few times during the first post-surgery year. And that's a good thing, it shows the doctor gives a shit about you.
-They didn't have ONE infection in over 1000 treatments? That seems very, very far fetched.
-From their website:
Naturopathic physicians are Doctors/Licensed Primary Care Providers with Prescription Rights (prescribing up to DEA Class II narcotics) who are specialists in holistic diagnosis and natural therapeutics.
Sounds like pseudoscience to me. I would never trust my health to any clinic that dabbles in - please forgive my wording - bullshit. Note that I didn't read their whole site, but as soon as I saw that name it rang a bell.
Maybe it's just me being too paranoid but better be safe than sorry.
If you are serious about carrying on with this treatment please do a lot more research into the subject, read some peer-reviewed scientific papers on the subject (might ask them which ones they base their treatments on), make sure you talk to their doctors (and verify they are actual doctors), try to get in contact with some of their eye patients and ask them about their outcomes. And most important of all - get a second, a third and a fourth opinion, from other doctors and other clinics.
Edit: reading my post again it looks like I'm bashing all stem cell treatments. I'm not and I think they have a LOT of potential to fix many problems, including yours. But this one sounds sketchy to me..