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Welcome to English in a Minute!
Tunnels are along and dark. If you drive a car through one, you have to keep your headlights on to see. So, is this what tunnel vision means?
Speaker A: Dan, I heard that you’re supporting that awful local official who’s involved in two…no, wait, three scandals?!
Speaker B: Well, That awful local official fixed the sidewalk outside my house. So, yeah. I support him.
Speaker A: Dan, that is some serious tunnel vision, dude.
As an idiom, tunnel vision means to have a very narrow viewpoint. People with tunnel vision are extremly focused on one thing or part of one thing. They ignore everything else that may be jusy as important.
*This article has been edited and reprinted from VOA Learning English with permission from Voice of America (VOA) for use in English language materials.
English 
日本語