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2. 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]

3. 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]

4. List of optometric abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_optometric...

   Vision (unaided) VA Visual acuity VA Dcc - VA Dsc Visual acuity with Distant chart with correctors Visual acuity with eye chart at Distant 20 feet (6 m) and with (cc: Latin cum correctore) correctors (spectacles); Dsc is without (sc: Latin sine correctore) correctors. See Visual_acuity#Legal_definitions: VA Nsc - VA Ncc

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 Vision, I Wear These Glasses Every Day. Trishna Rikhy. June 21, 2023 at 8:00 AM. ... Even if I had prescription glasses, I’d definitely still get a pair of Caddis frames with a ...

7. Eye examination - Wikipedia

   en.wikipedia.org/wiki/Eye_examination

   The visual acuity is assigned in the form of a fraction. Visual acuity is recorded as "20/20" (or another fraction like 20/40) when all optotypes (letters or symbols) on a specific line of the eye chart are correctly identified. When an individual correctly identifies additional 2 letters in the next 20/30 lines, then they will be assigned 20/40+2.