Tunnel Vision Definition
noun
A narrow outlook; specif., the focus of attention on a particular problem without proper regard for possible consequences or alternative approaches.
Webster's New World
Vision in which the visual field is severely constricted, as from within a tunnel looking out.
American Heritage Medicine
An extremely narrow point of view; narrow-mindedness.
American Heritage Medicine
(figuratively) To focus one's attention on one specific item or event, to the exclusion of everything else.; a one-track mind.
After Mark fell victim to tunnel vision, nothing you could say to him would change his mind.
Wiktionary
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