Normally that is called "tunnel vision". https://en.wiktionary.org/wiki/tunnel_vision https://en.wiktionary.org/wiki/tunnel_vision (figuratively) The tendency

Normally that is called "tunnel vision". https://en.wiktionary.org/wiki/tunnel_vision https://en.wiktionary.org/wiki/tunnel_vision (figuratively) The tendency to focus one's attention on one specific idea or viewpoint, to the exclusion of everything else; a one-track mind.