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"I have 20/20 vision!". How many times have you heard people brag about their 'perfect vision' in that way?? It is great to have 20/20 vision, but what does that term actually mean?? Is it really perfect vision? And what about blindness? How many times have you heard someone say "I am SO blind!!"....right before they get behind the wheel!! They are obviously not blind in any way shape or form! 20/20 Vision Defined The origins of 20/20 vision are a fairly interesting topic. The original examining lanes for eye doctors were 20 feet long. When doctors tested the vision of their patients, the patient was 20 feet from the eye chart. If they could read the lowest line on the chart without glasses, they were listed as 20/20, meaning that they could see those letters at a normal distance. prevacid and digestion 2737 aid prevacid prevacid oxford prevacid nexium bone loss