sharp-eyed
1. [ adjective ] keenly perceptive or alert
Synonyms: sharp-sighted quick-sighted
Examples:

"quick-sighted into the faults of the time"- Leonard Bacon

Related terms: perceptive
2. [ adjective ] having very keen vision
Synonyms: hawk-eyed keen-sighted lynx-eyed quick-sighted sharp-sighted argus-eyed
Examples:

"quick-sighted as a cat"

Related terms: sighted
3. [ adjective ] having keen eyesight
Related terms: eyed