letter of the top line is equivalent to 20/200. A person unable to
read this letter with best eyeglass correction is considered legally
The "T" and the "B" on the top line are equivalent
to 20/100. The second line is 20/50. Best corrected acuity in the
range between 20/50 and 20/100 is considered disabling in occupations
which require work with numbers or extensive reading.
third line is equivalent to 20/40, it is the "driver's test"
line. You must be able to read most of the letters on this line in
order to obtain an unrestricted drivers license in most states including
bottom three lines represent 20/30, 20/20 and 20/10. These are considered
to be "normal vision" with the 20/20 line being the traditional
normal vision line. It is generally felt that the maximum visual acuity
of the eye is around 20/15 or 20/16. This means that if you are able
to read the bottom line, you are probably a good guesser.
This vision test can only be considered a screening test. A variety
of factors such as lighting, glare, monitor quality may have an effect
on the results of this test.
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