The phrase "sharp eye" refers to having excellent vision or observation skills. It means being able to notice even small or hidden details. Full definition
Results oriented, Big - picture strategist with sharp eye for detail. (members.climber.com)
Part of being a great research assistant is developing a very sharp eye for detail, and my job at the library has definitely enabled me to develop that skill. (iresumecoverletter.com)
The medical staff keeps a particularly sharp eye out for those, though, and when any turn up, the space station gets a more - thorough - than - usual cleaning. (sciencedaily.com)