Eye Test Chart
George Mayerle (1870-1929) created his Eye Test Chart in 1907 while working as an optician in the heart of San Francisco. The chart was marketed as the only tool “that can be used by people of any nationality”. At the time, San Francisco’s immigrant population was swiftly growing. Anticipating the difficulties of providing services to such a diverse community, Mayerle developed this chart to cater not only to multilingual patients but also to children and illiterate adults.
The Eye Test Chart combined four major subjective tests performed during an exam. The vertical panels that run through the center of the image tested visual acuity. These panels include two styles of the Roman alphabet for English-speaking and European readers, Japanese, Chinese, Russian, and Hebrew scripts. Additionally, Mayerle included a center panel consisting of non-alphabetic characters for those who were unable to read any of the other writing systems offered. Directly above these panels in the center is a radiant dial used for testing astigmatism, and flanking this on each side are four sets of lines used to measure the muscular strength of the eyes. Finally, six color swatches line the bottom of the chart for testing color vision, a feature marketed as specifically useful for the significant number of railway and steamboat workers in the city.
