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what does 20/15 vision mean?

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What does it mean to have 20/15 vision?

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asked May 17, 2017 in Health by Isabella

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The standard eye chart used in the US is called the Snellen chart. It has 11 rows of letters that get smaller towards the bottom. The three bottom rows are marked 20/10, 20/15, and 20/10. Most young people have about 20/10 vision in the umbo, the central part of the retina corresponding to a visual field of 1/2 degree of arc. The umbo lies within the foveola, where vision is normally 20/15. The field of vision there is a little more than 1 degree (or 1 and 1/6). The foveola lies within the FAZ (foveal avascular zone) which has 20/20 vision at the periphery, and corresponds to 1-2/3 degree of the field of vision. All these regions lie within the fovea, where along the outer edge people have 20/30 vision (4th row from the bottom on the Snellen chart).

So 20/20 is just where someone decided to draw the line as "normal" or good enough. 20/15 means you can see at 20 feet what a person with 20/20 vision could only see at 15 feet. 20/15 is good but not unusual for young adults. Once you hit 50, 20/20 becomes the new normal for the foveola.
answered May 17, 2017 by Alexander
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Is 20/15 vision good?
In optometry, 20/15 vision is considered to be above average in terms of eye sight. By most metrics, 20/15 is the best vision rating that a person can receive and is even better than 20/20 vision.
20/20 vision represents what is thought of as average vision. A person with 20/15 vision, however, is expected to be able to read a line of text on an eye chart 5 feet closer than someone with average 20/20 vision. This explains why the second number is 15 instead of 20. In the United States, less than 10 percent of the population has been diagnosed with 20/15 vision.
answered May 17, 2017 by Dalton Handley
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What is 20/15 eyesight?
According to All About Vision, 20/15 eyesight is a measurement of visual acuity used in optometry, relating to eye test charts. The numbers indicate distance from the chart in feet.
According to Prevent Blindness, at a distance of 20 feet from the eye chart, a person with 20/15 vision sees the letters with the same visual acuity as a person with 20/20 standing 15 feet away from the chart would see. Normal eyesight is defined as 20/20 vision, although the average adult has stronger acuity, measured at 20/15 or 20/10, according to Prevent Blindness. An eyesight of 20/15 is equivalent to 6/4.5 vision using the metric scale. In most people, visual acuity diminishes with age.
answered May 17, 2017 by Sean
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What does 20/15 vision mean? My doctor told me that my vision was above normal.?
20/15 is an angular measurement of letter size. 20 is the test distance in feet, 15ft is the "distance at which the letter subtends 5 seconds of arc". its a letter size.
so yeah, 20/20 is normal & average vision/acuity...20/15 is better-than-average vision. its not really a true "comparison" of your vision (15) vs other people's vision (20), but you could probably think of it that way
answered May 17, 2017 by Brody

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