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2. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...

3. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   The metric equivalent is 6/6 vision where the distance is 6 meters. The 20/x number does not directly relate to the eyeglass prescription required to correct vision; rather an eye exam seeks to find the prescription that will provide at least 20/20 vision. [citation needed]

4. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity . Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor ...

5. A new surgery can give legally blind people 20/20 vision - AOL

   www.aol.com/news/2016-12-15-a-new-surgery-can...

   Within a few months, almost all patients went from having an average of 20/1290 vision to 20/20 vision! Even more amazing, the amount of time between the trauma and the treatment didn't seem to ...

6. Even With 20/20 Vision, I Wear These Glasses Every Day - AOL

   www.aol.com/lifestyle/even-20-20-vision-wear...

   Even With 20/20, I Wear These Glasses Every Day JOE LINGEMAN "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Shop Now $130 caddislife.com

7. 20 innovative breakthroughs that will transform your health - AOL

   www.aol.com/finance/20-innovative-breakthroughs...

   The drug industry has improved these medicines over the years, but the innovations have all reached back to the same 1950s playbook, and even so, for many—an estimated 10% to 30% of patients ...