To the Editor.
—The adoption of Système International units announced in a recent issue of the Archives1 has been a long time coming.2 It will certainly be distasteful to have to rememorize all laboratory values, but some generation of physicians has to do it sooner or later.I am happy to see that intraocular pressure will continue to be expressed in millimeters of mercury, since pascals (newtons per square meter) are so ungainly large.3 The advantage of retaining acuities in Snellen notation is arguable. It is nice for those of us in the United States, but Snellen notation is seldom used elsewhere in the world.
Drews RC. Adoption of SI Units. Arch Ophthalmol. 1986;104(11):1587. doi:10.1001/archopht.1986.01050230025013