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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. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...

4. Talk:Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Talk:Visual_acuity

   A shortsighted person who wears his/her –4 Diopter eye glasses will typically have 20/20 vision or better. A far sighted person of +4 Diopters will have 20/20 vision or better even without wearing his/her glasses provided things are sufficiently far away. A presbyopic person needs reading glasses, but, again, acuity will be normal once the ...

5. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

   www.aol.com/10-great-sites-buy-cheap-140036394.html

   You’ll get $20 off every successful referral and your friends will get $20 off their first order of $79 or more. Contributor Larissa Runkle specializes in finance, real estate and lifestyle topics.

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

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

   I have 20/20 vision, so wearing glasses that I don’t technically need to see is absolutely not happening—unless, of course, the glasses are stylish and cool enough for me to want to wear them.

7. Visual impairment - Wikipedia

   en.wikipedia.org/wiki/Visual_impairment

   Legally blind indicates that a person has less than 20/200 vision in the better eye after best correction (contact lenses or glasses), or a field of vision of less than 20 degrees in the better eye. Totally blind students learn via braille or other non-visual media.