Project Description

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) held 20 feet away. So what does 20/20 mean? If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance. If you have 20/100 vision, it means that you must be as close as 20 feet to see what a person with normal vision can see at 100 feet.