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What is Vision Acuity and Logic Exercises about?
Someone with 20/10 vision can see at 20 feet what a normal person can see when standing 10 feet away. It is not compatible to say that someone with 20/40 vision has excellent vision, because that person probably sees worse than a normal person. If the expression 20/20 were not that common in the United States, there would not exist how to measure good vision.
- Author
- Kronos Sac
- Language
- EN