ˌtunnel ˈvision noun [uncountable]

1. the tendency to only think about one part of something such as a problem or plan, instead of considering all the parts of it:
I’ve got tunnel vision when it comes to what I want to do.

2. a condition in which someone’s eyes are damaged so that they can only see things that are straight ahead

[TahlilGaran] Dictionary of Contemporary English ▲