The phrase "sharp eye" is often used to describe someone who is observant, vigilant, and discerning. There are many synonyms for this term that can be used to convey similar meanings. Some of these synonyms include eagle eye, keen eye, watchful eye, perceptive eye, and attentive eye. These words all suggest that the individual possesses a heightened ability to see and spot details that other people might miss. Additionally, the term "sharp eye" can be used to describe a person who is astute or quick-witted. In this context, synonyms such as shrewd eye, clever eye, and savvy eye could be used interchangeably.