What does tunnel vision mean?
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Tunnel vision means that the visual field becomes narrower. Nationalencyklopedin: “Binocular vision, tunnel vision, medical term, concentric constriction of the eye’s visual field with the remaining sight being centred in the field of vision.”
Simplified picture of tunnel vision:
Going through a tunnel could be called “tunnel vision”, but the medical meaning is significantly more common and established, i.e. the one you should use.
Tunnel vision can “arise when fatigue, alcohol or stress affect your vision.” (Driving Licence Book, 19th Edition, page 83).
This is an example of one of the driving theory questions at Körtkortonline.se (also in theory tests in Arabic).
There is also a driving licence book online (2023).
More examples of theory questions: