Definition of "keen-eyed" []

• Having keen eyesight (adjective)

WordNet. Princeton University. 2010.

• "In recent days, such keen-eyed observers as Glenn Beck, Sharon Angle, and your morbidly obese Uncle Bob have declared that a sinister conspiracy of Communists and Islamic fundamentalists has subverted the Obama administration and the judicial system, and that we are about to witness the coming of Sharia law to every hill, dale--and, perhaps, even to every glen--in America."
• "In recent days, such keen-eyed observers as Glenn Beck and your morbidly obese Uncle Bob have declared that a sinister conspiracy of Communists and Islamic fundamentalists has subverted the Obama administration and the judicial system"
• "Then in 1992, MTV premiered The Real World, and in a happy accident, a show I created, MTV UNfiltered, which that may well have given keen-eyed observers a clue as to what YouTube would become."