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This description, with the accompanying optotypes, is the outcome of work started by Dr. Green in 1886, when he had printed the original optotypes of this series for private distribution. The demand for these truly scientific charts was so great that Dr. Ewing compiled and elaborated the original charts, and made them available. Accompanying the charts is a booklet giving the history of the development of vision charts and the mathematical calculations on which these charts have been established. Both the charts and the booklet are in a handy form, and are a welcome addition to the armentarium of the ophthalmologist of precision.
Optotypes Consisting of Test-Letters and Pictographs for Measuring the Acuteness of Vision.. JAMA. 1923;81(9):775. doi:10.1001/jama.1923.02650090073041