Tunnel Vision is the second warp zone in Chapter 3: The Salt Factory, and is accessible through Level 3-7, Mind The Gap. It contains a bandage on the first and third stages.
This warp zone is considerably easy, and shouldn't be a problem for a somewhat-experienced player.
Obstacles in this warp zone include saw blades, collapsible blocks, and large empty spaces.
You could make it through Tunnel Vision with simple slides and jumps, but for the bandages you'll need to perform risky wall jumps-- maybe preserve a few collapsible blocks-- and be able recover from them.