Pseudo-Isochromatic Plates for Testing Color Perception.
Philadelphia, PA: American Optical Company, 1940. First Edition. Hardcover // Original wrappers. A pseudoisochromatic plate, often abbreviated as PIP, is a style of standard exemplified by the Ishihara test, generally used for screening of color vision defects. From the library of Dr. Oliver Sacks, the renowned neurologist, author, and educator.....
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