The term "20/20 vision" refers to how sharp your eyes are when you look at a standard eye chart (Snellen chart) from a distance of 20 feet (or 6 meters)—depending on where you live. In the United ...

Making time to catch the latest Netflix hit? Easy. Making time to visit the eye doctor? Surprisingly difficult. Enter: Online eye exams — because if you can do it from your couch, why wouldn’t you?