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Pseudo-Isochromatic Plates for Color Perception, American Opical Company, 1st Ed. [1940]. *Note: The aging of this book & potential ink/page discolouration is not suitable for current testing standards. Posted as a historical
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HRR 4th Edition Pseudoisochromatic Test - English Instruction Version from Good-Lite (Formerly Richmond Products, Inc.) - Product Description and Details
Comparison of Ishihara and Hardy-Rand-Rittler Pseudoisochromatic Plates in Non-Arteritic Anterior Ischaemic Optic Neuropathy
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The new Richmond HRR pseudoisochromatic test for colour vision is better than the Ishihara test - Cole - 2006 - Clinical and Experimental Optometry - Wiley Online Library
![HRR 4th Edition Pseudoisochromatic Test - English Instruction Version from Good-Lite (Formerly Richmond Products, Inc.) - Product Description and Details HRR 4th Edition Pseudoisochromatic Test - English Instruction Version from Good-Lite (Formerly Richmond Products, Inc.) - Product Description and Details](https://media.ophthalmologyweb.com/m/27/images/hrr-4th-edition-test-with-multi-language-instructions-15757-400x300.jpg?ts=638249807619659273)
HRR 4th Edition Pseudoisochromatic Test - English Instruction Version from Good-Lite (Formerly Richmond Products, Inc.) - Product Description and Details
![AO H-R-R pseudoisochromatic plates by Hardy, LeGrand; Rand, Gertrude; Rittler, M. Catherine: (1955) | Jason Rovito, Bookseller AO H-R-R pseudoisochromatic plates by Hardy, LeGrand; Rand, Gertrude; Rittler, M. Catherine: (1955) | Jason Rovito, Bookseller](https://pictures.abebooks.com/inventory/31126368464_2.jpg)