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Eye Test – Test Your 20/20 Vision
Last Reviewed: January 2, 2020
Ok, so the point is that I don't think eye test of optometrists really show your vision strength. I do believe that they are set up in an unnatural environment, in a setting your eyes will never have to deal with anything in real life.
But many of my customers have asked me how they can test their 20/20 vision, so here is a chart and the test:
Measure the length of the blue bar in centimeters. Step back from your screen as many feet as you measured centimeters, ie if it's 5 cm long, step 5 feet (1.5 m) back. ( 1 foot = 30cm)
Now check which line you can read.
The big "E" on the top is 20/200, he "T" & "B" 20/100.
The 2nd line is 20/50
The 3rd line is 20/40
The 4th line is 20/30
The 5th line is 20/20
The last line is 10/20
20/40 equals about -1 diopter, the limit for driving a car unrestricted (interesting that you don't need to drive with glasses at -1, don't you think).
20/200 supposedly equals -5 diopters.
So test your eyes, and see for yourself if your glasses might be too strong.
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