ph.

1. 管状视;视野狭窄
If you suffer from tunnel vision, you are unable to see things that are not straight in front of you.

2. 一孔之见;狭隘的眼光;井蛙之见
If you say that someone has tunnel vision, you disapprove of them because they are concentrating completely on achieving a particular aim, and do not notice or consider all the different aspects of what they are doing.

1. visual impairment involving a loss of peripheral vision