sharp-eyed vs keen-sighted

sharp-eyed and keen-sighted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sharp-eyed	No	Yes	No	No
keen-sighted	No	Yes	No	No

As adjectives, sharp-eyed and keen-sighted are synonyms defined as:

Other synonyms of sharp-eyed include argus-eyed, hawk-eyed, lynx-eyed, quick-sighted, sharp-sighted.

sharp-eyed (adjective)	keen-sighted (adjective)
having keen eyesight	capable of seeing to a great distance
keenly perceptive or alert	having very keen vision
having very keen vision