MacGyver: What's goin' on with your eyes?
Pete: What do you mean?
MacGyver: Well, I've been watchin' you bump into things. You came out here for apple juice, and that's orange juice.
(Pete tries to laugh it off and gets apple juice from refrigerator)
MacGyver: Hey, what's goin' on?
Pete: (resigned) It's my peripheral vision.
MacGyver: How bad is it?
Pete: Pretty bad. It's the real reason that I called you in when things fell apart at the railroad station. MacGyver, I have glaucoma.
MacGyver: That's treatable, isn't it?
Pete: Yeah, but mine is complicated. I have... advanced nerve damage—very advanced. It's a little bit like looking down a tunnel with very little light at the end. And I have a lot of trouble with either too much or too little light anywhere. I let it go too long.