I. noun
: a field of vision of 70 percent or less from the straight-ahead position resulting in elimination of the peripheral field
II. noun
: extreme narrowness of viewpoint ; also : single-minded concentration on one objective
• tunnel-visioned ˈ ̷ ̷ ̷ ̷ ¦ ̷ ̷ ̷ ̷ adjective