You may have seen the familiar chart in your doctor's office. Here’s a look at the history of the Snellen Eye Chart and how it's used to test your eyesight.
What Is 20/40 Vision? (Is It Bad?)
What Does 20/20 Vision Mean?
20/20 Vision and Understanding Your Visual Acuity Score - North Florida Cataract and Vision
What Does 20/20 Vision Mean and How Is It Measured?
Snellen chart - Wikipedia
Top 4 Eye Charts Used During Eye Exams
What Is 20/20 Vision? (Visual Acuity Measurements Explained)
What's That Eye Chart All About?
20/20 Vision: How to convert 20/20 based measure to Diopters
What Is Visual Acuity and How Is It Tested?
What Does 20-20 Vision Mean?