"tunnel vision" is what paintball players refer to when someone is only focussing on one small area or target, totally oblivious to other targets or threats around them.
(in terms of introspection): to look through one's soul as if it were a tunnel and see nothing but darkness and despair.
depression and drug addiction are hard to treat in part because the depressed and the addicted often have tunnel vision when it comes to introspection and think that there is no way out, so much so that they are even afraid to go and ask for appropriate help.
By Gillie
Tunnel Vision
a way of seeing, especially in males, when checking out a hot or in rare case large butted individual. To engage tunnel vision is to ignore all other movements, actions, and people in your periphery while only focusing on that sexy individual.
"Yeah but after 160mph I started to get tunnel vision"
By Jsandye
Tunnel Vision
the loss of peripheral sight, which makes it look like one’s vision is restricted to a narrow tube. It represents an individual focusing solely on one goal and suggests purposeful ignorance of evidence contradicting their pursuit of the goal.
When all of your vision is consumed by one piece or portion of an entire landscape or photo. This is due to the interest in that one aspect of the picture; Common things which cause tunnel vision are both ass and titties.
Jim: Hey, look at how nice that sunset is behind all of those people!
Randy: Wow, I never noticed that because I got tunnel vision from the girl's rack in the middle.
By Karol
Tunnel Vision
"Tunnel vision" is when a World of Warcraft player stick on one target in arena and doesn't switch at all. Kind of walking straight down a tunnel.