hawkeye
n. countablen. a person who has very sharp vision and notices every small detail. You use this to describe someone who is excellent at spotting things that others miss.
n. a person characterized by exceptionally keen sight or a high degree of attentiveness to detail. Often used metaphorically to describe someone who monitors a situation with extreme vigilance.
The editor has a hawkeye for spotting tiny spelling mistakes.
With her hawkeye for detail, the lead investigator noticed the slight discrepancy in the witness's original statement.
The veteran scout watched the game with a hawkeye, evaluating the subtle mechanics of the pitcher's delivery that less experienced observers might have overlooked.
Often used in the singular with the indefinite article 'a' to describe a person's trait.