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Basically you have the Snellen test and with the black letters and white background, what you get out is one number and as we know the average number is 20/20. The bottom line is 20/20 is not enough. Contrast sensitivity on the other hand using sine-wave gratings provides a much more sensitive and complete measure of vision and in my early research in the air force and continues today with my night driving simulator shows that basically it is the contrast sensitivity curve we have in our head that predicts how well we are going to detect and identify targets for example at night.