Sorry to say I can’t recall enough details to find a source, but I read an article once about a man who had been blind since birth, but as an adult was able to

Sorry to say I can’t recall enough details to find a source, but I read an article once about a man who had been blind since birth, but as an adult was able to have his vision restored surgically. It was a catastrophe. His brain was like an untrained neural net - the input was there, but he couldn’t make sense of it. He described it as seeing an undifferentiated field of color, where he couldn’t distinguish objects. Blind, he was able to confidently live his life and get around his city (I believe NY but no promises). Sighted, he was terrified to cross the street. On the other hand, I figure that if there’s a concern that laymen immediately raise, medical researchers are well aware of it as well. If they’re going forward, there’s a reason.