Twenty vision

Glenn Carp, the main concern of having 6/6 vision or 20/20 normal vision really comes from whether you are based in the United Kingdom or you are based in America. It is really just to do with feet and metres.
It is possible to see better than the norm, which optometrists express as visual acuity of 20/16 or 20/12.5, or better. 6/6 means you see at 6 metres what an average person can see at six metres, and 20/20 is the equivalent in feet, twenty feet versus twenty feet. For example, 100 of London Vision Clinic patients (-1.00D to -9.00D) see 20/32 or better, and 100 of patients (1.00D.00D) see 20/40 or better after Laser Eye Surgery. A legally blind person is one who cannot read the E even with the best possible glasses. When optometrists or surgeons say gaining or losing a line of vision, they mean the change in ability to read a line on the eye chart without glasses after surgery, from the ability to read the line with glasses, before surgery. In the most common visual acuity test, an optometrist places an eye chart at a standard distance, twenty feet, or six metres, depending on the customary unit of measure. In Laser Eye Surgery, the surgeons goal is to get your vision without glasses after surgery to the same level as your best-corrected visual acuity (with glasses or contact lenses) before surgery, or better.

The Rods and Cones of the Human Eye - Georgia State University

On Twenty-One Love Poems - maps-legacy The chart is at a twenty bike distance of twenty feet, but a person with normal acuity can read these letters at a distance of forty feet. At this distance, the symbols on the line representing normal acuity on the eye chart, designated 20/20, is the smallest line that a person with normal acuity can read at a distance of twenty feet. Three lines above, the letters have twice the dimensions of those on the 20/20 line. Many people with moderate myopia cannot read the E without glasses, but have no problem reading the 20/20 line or 20/15 line with glasses.
So the average normal vision in the general population would mean that what someone sees at twenty feet an average person can see. If you have better vision than 20/20 for example 20/16 it means that you can see at twenty feet what an average person can only see at sixteen feet and of course the opposite if you are 20/40. For example, 97 of our short-sighted patients see 20/20 or better after surgery (which includes patients who see 20/16 or better, and patients who see 20/12.5 or better). This line is the ratio 20/40 (or 6/12). Many people with refractive errors have the misconception that they have bad vision because they cannot even read the E at the top of the chart without glasses. . If this is the smallest line a person can read, the persons acuity is 20/40, meaning, in a very rough kind of way, that this person needs to approach to a distance of twenty feet to read letters. The biggest letter on an eye chart often represents an acuity of 20/200, the value that is legally blind. Mr Glenn Carp explains what 20/20 and 6/6 mean. In this short 35 second video.

Mr Glenn Carp The main concern of having 6/6 vision or 20/20 normal vision really comes from whether you are based in the United Kingdom or you are based in is really just to do with feet and metres. 6/6 means you see at 6 metres what an average person can see at six metres, and 20/20 is the equivalent in feet, twenty feet versus twenty feet. The daylight vision (cone vision) adapts much more rapidly to changing light levels, adjusting to a change like coming indoors out of sunlight in a few seconds. Like all neurons, the cones fire to produce an electrical impulse on the nerve fiber and then must reset to fire again. The light adaption is thought to occur by adjusting this reset time.

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