Chromaticity co‐ordinates of Ishihara plates reveal that hidden digit plates can be read by S‐cones - Miyahara - 2009 - Clinical and Experimental Optometry - Wiley Online Library
Ishihara's Test for Colour Deficiency: 38 Plates Edition – Colblindor
![Figure 22, [a, the hidden-digit plate of...]. - Webvision - NCBI Bookshelf](https://www.ncbi.nlm.nih.gov/books/NBK11538/bin/kallcolorf22.jpg "Figure 22, [a, the hidden-digit plate of...]. - Webvision - NCBI Bookshelf")
Figure 22, [a, the hidden-digit plate of...]. - Webvision - NCBI Bookshelf
ISHIHARA's TEST CHART BOOK FOR COLOUR DEFICIENCY: 38 PLATES | LATEST EDITION – Zaid Book Depot
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Ishihara's Test for Colour Deficiency: 38 Plates Edition – Colblindor
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Ishihara test - Wikipedia
ISHIHARA's TEST CHART BOOK FOR COLOUR DEFICIENCY: 38 PLATES | LATEST EDITION – Zaid Book Depot
Webvision: Color Perception
Ishihara's Test for Colour Deficiency: 38 Plates Edition – Colblindor
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Ishihara's Test for Colour Deficiency: 38 Plates Edition – Colblindor
Color Vision Deficiency and Ishihara's Test
Ishihara's Test Chart books for color deficiency 14 plates with manual
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Ishihara's Test for Colour Deficiency: 38 Plates Edition – Colblindor
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Ishihara's Colour Deficiency Test - YouTube
Ishihara's Test Chart books for color deficiency 14 plates with manual
