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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