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Visual acuity - Wikipedia, the free encyclopedia
In the term "20/20 vision" the numerator refers to the distance in ... 20/20 vision can be considered nominal performance for human distance vision; 20/40 ...
http://en.wikipedia.org/wiki/Visual_acuity
HowStuffWorks "What does it mean when someone has 20/20 vision?"
What does it mean when someone has 20/20 vision? ... If you have 20/40 vision, it means that when you stand 20 feet away from the chart you can see what a normal ...
http://www.howstuffworks.com/question126.htm
2020 vision and visual acuity
20/20 is commonly used for a pilot's license and 20/40 for a driver's license, ... 20/40 vision in at least one eye is the vision required to pass the driving test ...
http://www.agingeye.net/visionbasics/healthyvision.php
The Eye Chart and 20/20 Vision - AllAboutVision.com
Eye tests can determine your visual acuity; here's a sample eye chart and explanation of 20/20 vision.
http://www.allaboutvision.com/eye-test/
Take The Snellen Eye Test Online
Take the Snellen Eye Test online, to determine your vision strength i.e. 20/20, 20/40, etc.
http://www.eyes-and-vision.com/take-the-snellen-eye-test-online.html
Vision and Vision Correction
Having 20/20 vision means seeing at 20 feet what a person with normal vision sees at 20 feet. ... 20/40 vision can see at 20 feet what the person with normal vision ...
http://www.agingeye.net/mainnews/vision.php
Vision Correction Surgery Options, LASIK & Others - visionchannel
About 50% of patients achieve 20/20 vision and about 85% achieve 20/40 vision. ... Approximately 93% have 20/40 vision or better following LASIK. ...
http://vision.healthcommunities.com/refractivecorrection/surgery.shtml
20/20 vision: Measuring your visual acuity at MyOptiLASIK.com
20/20 vision and other measures of visual acuity are explained at MyOptiLASIK.com.
http://www.myoptilasik.com/20-20-vision.asp
20/20 Vision - Definition of 20/20 Vision
The smallest line you can read on a chart is your visual acuity. Perfect visual acuity is written as 20/20.
http://vision.about.com/od/eyeexaminations/g/acuity_test.htm
How to Increase Vision From 20/40 to 20/20 With Glasses ...
How to Increase Vision From 20/40 to 20/20 With Glasses. 20/20 vision is not "perfect" vision, as it is sometimes mistakenly called, but is in fact ...
http://www.ehow.com/how_6012097_increase-vision-20_40-20_20-glasses.html