When you go to the eye doctors
When you go to the eye doctors, you are required to read a ABC chart. The reason you read off of this chart is to see how good your vision is. If you can read down all the way on the chart then you have 20/20 vision which is considered normal vision. This also means that you might not be required to wear glasses. However, when you can’t read all the way down the furthest you can read, that number is over 20. For example, if you can only read the top line then you have 200/20 vision, this means that you are considered legally blind.