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It means your a newborn.
It means seeing at 20 feet what a person with normal vision sees at 20 feet. A person who has 20/40 vision can see at 20 feet what the person with normal vision sees at 40 feet, etc. Some people have better than 20/20 vision.
20/100 Vision would mean that the average person can see clearly at 100 feet you must be 20 feet away to see the object clearly.
"2400 Denier Polyester and 900 DenierMicro-Polyester fabric"
This phrase would normally be used metaphorically, rather than as a description of a person whose eyes are working well. To have clarity of vision is to understand things well. The vision in question is a kind of internal vision, an ability to envision.
Your vision at 20ft is my vision at 50ft.
A vision is a day dream or thought of either something a person feels is about to happen or of something that did happen (the latter is called a flashback).
It means that a person needs to be within 20 feet to clearly see what someone with "normal" (20/20) perfect vision can clearly see at 25 feet. It's good but not perfect vision
It means that u can see at 10 ft what an average person sees at 20 feet. and the average vision is 20 20
2700-2400/2400= 300/2400=.125 12.5%
Tunnel vision (also called "Kalnienk Vision")
A technical person's vision should be 20/20. They need to have near perfect vision in order to do their job. This vision can be achieved through the use of glasses or contacts.