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en.wikipedia.org/wiki/Visual_acuity

Visual acuity (VA) commonly refers to the clarity of vision. Visual acuity is dependent on optical ... Visual acuity is typically measured while fixating, i.e. as a measure of central (or foveal) vision, for the reason that it is highest there. However ...

www.allaboutvision.com/eye-test

During an eye test, eye doctors use eye charts to measure how well you see in ... 20/20 vision is considered "normal" vision, meaning you can read at 20 feet a ...

eyecaretyler.com/resources/how-the-eye-works/what-does-2020-mean

Visual acuity is usually measured with a Snellen chart. Snellen charts display letters of progressively smaller size. "Normal" vision is 20/20. This means that the  ...

www.visionaware.org/info/your-eye-condition/eye-health/low-vision/low-vision-terms-and-descriptions/1235

Visual acuity is a number that indicates the sharpness or clarity of vision. A visual acuity measurement of 20/70 means that a person with 20/70 vision who is 20 ...

commonwealtheyes.com/2020-vision-2010-vision-2040-vision-what-do-all-these-numbers-actually-mean

Commonwealth Eye Surgery can perform procedures to get you 20/20 vision. What does ... For example, if you measured the E at 2 inches, you would need to sit ...

www.aao.org/eye-health/tips-prevention/what-does-20-20-vision-mean

Nov 30, 2016 ... A person with 20/20 vision can see what an average individual can see on ... Outside the United States, vision is measured in meters instead of ...

www.aao.org/eye-health/ask-ophthalmologist-q/how-is-near-vision-measured

Jan 4, 2016 ... Can a near vision acuity be used to determine if a person is legally blind? ... Near vision is traditionally measured with a hand-held card similar ...

www.todayifoundout.com/index.php/2013/12/2020-vision-scale-works

Dec 31, 2013 ... So what exactly are eye doctors measuring, and how can the scale be ... So, if you take someone with 20/20 vision and put them 200 feet away ...

www.vision-training.com/en/Vision%20test/Vision%20measurement.htm

The 20/20 label is a relative measurement of how well you see. If you can see a 9 mm letter at a distance of 6 meters (20 feet) then you have 20/20 vision.