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The rapid exhaustion of the first edition of this book showed its popularity. There is no particular change in the second edition. Attention is again drawn to the observation of the directions and rules in the use of this method for determining defects in color vision. The number of plates has been increased for differential diagnosis, but the series in general has not been enlarged. Three new plates, 10, 11 and 13, are inserted to replace plates 6, 12 and 15. The experimental work in the selection of the color combinations has been done as before in the laboratory for color vision of the Hirshman Ophthalmic Institute and in the Second Ophthalmic Clinic of the Kharkov University.
Knapp A. Polychromatic Plates for Testing Colour Vision. Arch Ophthalmol. 1940;24(2):426–427. doi:10.1001/archopht.1940.00870020218032
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