{"product_id":"pseudo-isochromatic-plates-ao-1940","title":"Pseudo-Isochromatic Plates for Testing Color Perception","description":"\u003cp\u003eAn extraordinary piece of medical and scientific history. This is the American Optical Company's eighteen-plate selection of color blindness test charts, approved by the Inter-Society Color Council Subcommittee on ISCC Problem 11: Color Blindness Studies, and engraved and printed by Beck Engraving Co., Inc., Philadelphia and New York.\u003c\/p\u003e\n\u003cp\u003eThe plates correspond to the Hardy, Rand, and Rittler standards from the Institute of Ophthalmology, New York. Housed in its original cloth-covered slipcase, which shows heavy wear with fraying at corners and edges. The spiral-bound test book itself is in good condition with all eighteen plates present and colors vivid.\u003c\/p\u003e\n\u003cp\u003eExceptionally rare: stamped on the interior with the inventory seal of the New York University Post Graduate Medical School, Dept. of Medicine, dated February 23, 1950, and numbered No. 18. A genuine artifact of mid-century medical practice and visual science.\u003c\/p\u003e","brand":"American Optical Company","offers":[{"title":"Default Title","offer_id":41668527456389,"sku":null,"price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/2403\/2389\/files\/IMG_8670.jpg?v=1779722509","url":"https:\/\/thehoundbooks.com\/products\/pseudo-isochromatic-plates-ao-1940","provider":"The Hound Books","version":"1.0","type":"link"}