Better search here $1 there are some with results or pubmed its most subjective soruce it depends on what disease he has but I haven't heard of anyone having restored their vision. I have contact with numerous people, 2 blind schools from 2 different countries, know people who flew to China Germany Italy Russia Egypt USA for "stem cell treatments" to private "clinics" not only for eyes and fundraised paid hundreds thousands for multiple treatments - it doesn't work yet they can't control it yet at all, cells are dying out after weeks or months or in worst cases turning into cancer - they are "miracle" cells they can turn into anything after infusion no matter if they're your cells or embryonic ones all of them are having this ability. After those treatment theres no follow up long term care as it should always be when doing proper human clinical trials theres no proper safety. If you want to try such thing then search only trough clinicaltrials.gov its international worldwide.

I myself was on clinical trial for other disease that sadly ended due to Corona I didn't get any money for it but I got free first priority health care, free novel innovative drug candidate not available on the market, frequently health exams tests and special emergency numbers just in case. I had to come in quite frequently and fill in lots of paperwork every time but I may contributed to creating a new medication. I hope after Corona they restart and I can participate again because it helped me a lot.

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I've heard of nothing.

Not that I've found of anything of the like. I also have optic nerve damage.

not as far as I know, I have optic nerve damage, but there is hope... $1