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Start Over Authors Ewing, Arthur Eugene, 1855-1929, author ✖Remove constraint Authors: Ewing, Arthur Eugene, 1855-1929, author Authors Green, John, 1835-1913, author ✖Remove constraint Authors: Green, John, 1835-1913, author Titles Optotypes, consisting of test-letters and pictographs for measuring the acuteness of vision ✖Remove constraint Titles: Optotypes, consisting of test-letters and pictographs for measuring the acuteness of vision

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