Pseudo-isochromatic plates for testing color perception

Catalogue Number: 2092
Pseudo-isochromatic plates for testing color perception
Category: Equipment
Sub-Category: Colour Vision Test
Corporation: American Optical Company
Year Of Publication/Manufacture: 1940
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Philadelphia USA
Publisher/Manufacturer: Beck Engraving Company Inc
Description Of Item: Navy blue cloth cover, gilt lettering, hinged spine so that the pages can be turned in one of two directions, or extended out, 24 pages with 2 pseudo-isochromatic plates pasted on each page. Grey card cover booklet, 11 pages, that gives a brief explanation of color blindness, the purpose of the test and directions for its use. The booklet slips into a pocket on the inside of the front cover.
Historical Significance: These plates are a variant of the earlier Stilling (Cat No 263) and Ishihara plate tests (Cat Nos 626, 1344, 1649, for abnormal colour vision. They enjoyed some use in the 1940s by the USA defence forces and in optometric practice but were superseded when the company introduced the American Optical HRR test in 1955 (See Cat No 627).
How Acquired: Purchased by Kett Museum (bought from Abe books)
Date Acquired: Sept 2012
Condition: Fine
Location: Archive room. West wall. Unit 1 Drawer 1

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