tunnel vision

uncountable figuratively

A restricted field of vision as the result of looking through some type of object or a medical condition.

Japanese Meaning

対象を通して見ることで生じる、あるいは医学的な状態によって引き起こされる、視界が狭く制限される現象。 / 狭い視野、限定された視界

After the accident he suffered tunnel vision and could only see a small area ahead.

事故の後、彼は視野が狭くなり、前方のごく狭い範囲しか見えませんでした。

Sense（1）

A restricted field of vision as the result of looking through some type of object or a medical condition.

Sense（2）

(figuratively) The tendency to focus one's attention on one specific idea or viewpoint, to the exclusion of everything else.

After Mark fell victim to tunnel vision, nothing you could say to him would change his mind.