Online Eye Exam
Directions for Part I.
The blue "standardization bar" must be measured in centimeters
on your computer screen or printout. You should then stand in a position
back from your computer screen so that your eye is this same number of feet
from the screen. i.e. if the blue bar measures 9 1/2 centimeters in length,
you should stand back so that your eye is 9 1/2 feet from the screen.
Vision testing should be performed on each eye separately,
wearing distance eyeglasses if required. There are six lines on the screen,
you should note the last line number in which you can read most (50-75%)
of the letters.
The middle letter of the top line is equivalent to 20/200.
A person unable to read this letter with best eyeglass correction is considered
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.
The 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
The 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.
Directions for Part II.
- Wear your glasses if you usually use glasses for
- Can you see the four corners of the large square
- Can you see the small squares?
- Are the lines straight?
- Is there any distortion?
If you answered "yes" to question 5 or "no" to questions
2, 3, and 4 you should consult an Eye Care Professional as this
may indicate a potential health problem.
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.
The American Optometric
Association (A.O.A) highly suggests yearly eye exams to ensure ocular health.
concurs with the A.O.A.'s philosophy