Longman Dictionary of Contemporary English homepage

tunnel vision

noun
     
Related topics: Illness and Disability
tunnel vision [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.
2MI a condition in which someone's eyes are damaged so that they can only see things that are straight ahead

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