"Imagine sitting there with your doctor and he tells you that we don't know whether or not this is gonna help you or this is gonna hurt you. We don't know whether or not these stem cells are gonna turn into some sort of tumor, or other problem, or whether it's gonna remove the remaining vision that you have in that eye." Even with these warnings, two of Schwartz's patients agreed to let him inject 50,000 cells into one of their eyes in July. Both women had lost so much vision and the dose they got was so low that no one expected the cells would actually help them see better. But within weeks, both started to think something might be happening. "I sort of like woke up one morning and did realize that, you know, there is a difference between the two eyes now. They only worked on the left eye. The furniture on the other side of the room has a lot of - I have some hand-carved furniture there, and I could actually see the detail on the carving. You know, on the other side of the room there, on things that I couldn't see from that distance before." This patient had started going blind in her 20s because of a disease called Stargardt's macular dystrophy. She's in her 50s and lives in Los Angeles. She didn't want her name used because she's worried about losing work. It turns out, she's a graphic artist.