Excessive concentration refers to an unbalanced state of one entity or aspect. In other words, it means focusing too much on something at the expense of other things. Some suitable synonyms for excessive concentration include obsession, fixation, preoccupation, myopia, tunnel vision, and narrow-mindedness. Obsession pertains to a persistent mental preoccupation, usually irrational and uncontrollable. Fixation refers to an obsessive attachment or interest in something that is difficult or impossible to change. Preoccupation pertains to mental distraction or excessive thinking about something. Myopia describes a condition of nearsightedness or extreme narrow-minded vision. Tunnel vision means having an extreme focus on one thing while ignoring other aspects. Narrow-mindedness refers to a persistent rigid attitude or limited perspective on things.