"It's hard to explain what it's like for someone who never had one," says Bergeron. "At first, the light is bothering you. The noise is bothering you. Walking for a short distance makes you dizzy. You have headaches. You feel nauseous. Your memory is gone. There's a lot of stuff that stinks. Stuff we take for granted every day. It's tough. You try to do something and you feel good. And then the next day you try to do the same thing and you feel terrible, and you have to go to bed."