A "20/20 angular resolution" is not a standard term in optics or vision. The term "20/20 vision" is used to describe normal visual acuity, which is a measure of how well a person can see compared to a standard vision chart from a specific distance. In the context of "20/20 vision," the numbers represent a fraction. The first number (20) represents the testing distance in feet, and the second number (20) represents the distance at which a person with normal vision should be able to read a particular line on a standard eye chart. If someone has 20/20 vision, it means they can see at 20 feet what a person with normal vision can see at 20 feet. This is considered "normal" or "average" vision.