1. (

• argus-eyed ,
• hawk-eyed ,
• keen-sighted ,
• lynx-eyed ,
• quick-sighted ,
• sharp-eyed ,
• sharp-sighted

) having very keen vision; "quick-sighted as a cat" ;

2. (

• quick-sighted ,
• sharp-sighted ,
• sharp-eyed

) keenly perceptive or alert; "quick-sighted into the faults of the time"- Leonard Bacon ;