jerry spires is a very good beginning to life. but how did you accomplish what you accomplished with this handicap? you went to harvard. you made a major invention. you've led a rich life. you're happily married. >> well, i told you, the centerpiece is sue, and then my family, my children, paul and jimmy and katherine have stuck by me, and these two guys, who as you say, i was really fortunate enough to meet when we all started columbia together. but, you know, it's not all black or dark. i don't want to leave that impression with you, because when you're not distracted by visual images, you develop a life within your mind. so i can see you now, eric, the way i saw art back before i was 19 here in this city, and you look pretty damn good, you know. (laughter) >> charlie: you are why we do this television program, so thank you. let me turn to carla. let me give you an overview so we understand exactly what it is we're talking about in terms of the human eye. >> well, vision is really miraculous process, and to hear about losing it