I've been seeing a steady parade of research talking about restoring sight. Gene therapy, electrical signals on the optic nerve, various chemical treatments. S

I've been seeing a steady parade of research talking about restoring sight. Gene therapy, electrical signals on the optic nerve, various chemical treatments. Some of these even get mildly positive results in human clinical trials. But then it's silence from it. Anyone more educated on the subject matter than myself have any thoughts on the matter?