tunnel vision
noun/ˌtʌnl ˈvɪʒn/
/ˌtʌnl ˈvɪʒn/
[uncountable]- (medical) a condition in which somebody can only see things that are straight ahead of them
- (disapproving) a lack of ability to see or understand all the aspects of a situation, an argument, etc. instead of just one part of it
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tunnel vision