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To the Editor:
—Our use among ophthalmologists in the U. S. A. of the 20/20 and other foot designations of vision and other measurements could with great profit be changed to the metric system.For one used to the metric system, to run on to the foot designations by men of caliber in ophthalmolic science publishing articles in our American ophthalmic publications, which go around the world, and in ophthalmic publications of other countries seems to one using the metric system all of the time something unintelligible. It takes a good deal of calculation that is troublesome for one used to the metric system to translate the unscientific 20/180 and other foot figures into something understandable.I have heard the reaction of astonishment and perplexity among those who are used to the metric system when they see us using the foot designation.With the exception of America, the metric system