To the Editor.
—"Effective January 1973... AMA scientific publications... will publish measurements only in a modified metric system..."1In June 1968, the National Bureau of Standards made recommendations for the uniform use of the International System of Units. In January of 1971, they issued a revision.2 A number of the readers of the Archives are undoubtedly familiar with this material since it was adopted as a recommended standard by the Journal of the Optical Society of America in September 1968.One unit dear to the hearts of ophthalmologists may need to be preserved to avoid anguish. The term "millimeters of mercury" (mm Hg) falls into the category of "not acceptable"3 and one whose "use is to be progressively discouraged and eventually abandoned."4 At the present time, it is acceptable for use in the Journal of the Optical Society of America only when it is "employed
Drews RC. Metrication. Arch Ophthalmol. 1973;89(5):438-439. doi:10.1001/archopht.1973.01000040440018