cannot see further than the end of one’s nose
can't see (any) further than the end of (one's) nose
1. To lack the ability to foresee problems, issues, or obligations beyond the present or immediate future. Our boss is ambitious, but she can't see any further than her nose when it comes to scheduling projects with realistic deadlines.
2. To be so preoccupied with oneself or one's own problems as to be unaware of or indifferent to larger issues or other people. My ex-husband is always so wrapped up in work that he can't see further than the end of his nose, hardly ever making any time for me or the kids.