![\"\"](\"https:\/\/66.198.240.31\/~eyecare\/blog\/wp-content\/uploads\/2013\/03\/od.jpg\" "\\"od\\"")
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Everyone Loves their OD, Even Justin Timberlake!<\/strong><\/p>\n I\u2019m a fan of JT and it looks like his is a fan of his Eye Doctor! When I saw this I couldn\u2019t resist writing a blog about 20\/20 vision! Just what exactly does 20\/20 vision mean?<\/p>\n Visual acuity is usually measured with a Snellen chart.<\/p>\n The expression “20\/20” is so common in the United States that there’s even a TV show named after it. But what does it really mean? Here’s where the 20\/20 designation comes from.<\/p>\n By looking at lots of people, Optometrists have established what a “normal” or average human being should be able to see when standing 20 feet away from an eye chart. If you have 20\/20 vision, it means that when you stand 20 feet away from the chart you can see what the “normal” human being can see. (In metric, the standard is 6 meters and it’s called 6\/6 vision). In other words, your vision is “normal” — most people can see what you see at 20 feet.<\/p>\n If you have 20\/40 vision, it means that when you stand 20 feet away from the chart you can see what an average human can see when standing 40 feet from the chart. To further clarify: if there is a person with \u201cnormal\u201d vision standing 40 feet away from the chart and you are standing only 20 feet away from it, you both can see the same detail. 20\/100 means that when you stand 20 feet from the chart you can see what a person with \u201cnormal\u201d vision standing 100 feet away can see. 20\/200 is the cutoff for legal blindness in the United States.<\/p>\n You can also have vision that is better than the norm, which is stated in the opposite ratio. A person with 20\/10 vision can see at 20 feet what a person with \u201cnormal\u201d vision can see at 10 feet.<\/p>\n 20\/20<\/strong> – Normal vision. Fighter pilot minimum. Required to read the stock quotes in the newspaper, or numbers in the telephone book. So all this leads me to ask\u2026Is JT saying is new CD is a \u201cNormal\u201d or \u201cAverage\u201d Experience???<\/p>\n Next Posting:<\/strong> What the heck is that thing in front of JT\u2019s face and what does it do??<\/p>\n","protected":false},"excerpt":{"rendered":" Everyone Loves their OD, Even Justin Timberlake! I\u2019m a fan of JT and it looks like his is a fan of his Eye Doctor! When I saw this I couldn\u2019t resist writing a blog about 20\/20 vision! Just what exactly … Continue reading ![\"\"](\"https:\/\/66.198.240.31\/~eyecare\/blog\/wp-content\/uploads\/2013\/03\/snellen-chart.jpg\" "\\"snellen-chart\\"")
<\/p>\nLevels of Vision<\/strong><\/h2>\n
\n20\/40<\/strong> – Able to pass Driver’s License Test in all 50 States. Most printed material is at this level.
\n20\/80<\/strong> – Able to read alarm clock at 10 feet. News Headlines are this size.
\n20\/200<\/strong> – Legal blindness. Able to see STOP sign letters.<\/p>\n