This one is probably not strange to most people, but it is to me because I don’t have it. (I have something called Myopia…and a few other things that I will discuss in later posts I thought I’d dig up some information on it and share it with you anyway. The really strange ones will come soon enough.
So, what is normal vision?
Source: Thomas Eye Group, Atlanta
Studies have found that “normal” vision is being able to see a certain size line on the eye chart (the Snellen Chart) from 20 feet away. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance. If you have 20/40 vision, it means that you must be as close as 20 feet to see what a person with normal vision can see at 40 feet. So, the first number refers to the distance you stand from the chart, and the second number is the distance a person with normal vision could read the same line you correctly read – the larger the second number, the worse the vision.
Source: How Stuff Works
You can also have vision that is better than the norm. A person with 20/10 vision can see at 20 feet what a normal person can see when standing 10 feet away from the chart.
People with normal vision can read the entire, standard eye chart without seeing any blurry letters. Inability to drive because of lack of eyesight is never an issue for people with normal vision.