1. AO H-R-R Pseudoisochromatic Plates for detecting, classifying and estimating the degree of defective color vision. (I have 2 copies in almost "mint" condition)


AO-H-R-R-PLATES-COVER


AO-H-R-R-INSIDE


H-R-R TEST SHEET 1


2. AO Pseudo-isochromatic Plates for testing color perception (1940)

AO-PSEUDO-ISOCHROMATIC-PLATES-COVER


AO-PSEUDO-ISOCHROMATIC-PLATES-INSIDE


3. AO Pseudo-isochromatic Plates for testing colour perception (R.C.A.F. Modification)

RCAF-PSEUDOISOCHROMATIC-PLATES