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
HRR Pseudoisochromatic Color Vision Test
Color Vision Test - Jutron Vision
Score sheet of HRR 4 th edition of colour vision test. | Download Scientific Diagram
HRR Score Sheets
AO Plates | Young Expressions
The new Richmond HRR pseudoisochromatic test for colour vision is better than the Ishihara test - Cole - 2006 - Clinical and Experimental Optometry - Wiley Online Library