sharp–eyed 
/ˈʃɑɚpˈaɪd/ adjective
/ˈʃɑɚpˈaɪd/ adjective 1 : having very good eyesight
▪ a sharp-eyed bird 2 : having a strong ability to notice things
▪ A sharp-eyed [=perceptive] reader will notice the book's repeating themes.
▪ a sharp-eyed bird
▪ A sharp-eyed [=perceptive] reader will notice the book's repeating themes.
