Keen-eyed is a term used to describe someone who has a sharp and perceptive sense of vision. However, there are many synonyms for keen-eyed that can also be used to describe someone with this quality. Some alternatives to keen-eyed include observant, vigilant, sharp-sighted, eagle-eyed, hawk-eyed, and perceptive. These terms all convey a sense of someone who is acutely aware of their surroundings and can quickly pick up on even subtle details. Whether you need to describe a sharp-eyed bird watcher or a perceptive detective, these synonyms for keen-eyed can help you convey the right message.