By placing the test 14 inches from your face, equivalent to the average length of a forearm, you will be able to perform the diopter test optimally.
Of course, be sure to remove any vision devices such as glasses or lenses to get a fair measure of the correction your eyes need.
Once you are comfortable, perform the diopter test by reading each line from top to bottom. If you can't read a line, refer to the number to the left of the line: This is the correction you need.
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