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Ishihara test - Wikipedia

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Ishihara test - Wikipedia

Color blind glasses - Wikipedia

Relying on colors alone will mislead your visitors

File:Eight Ishihara charts for testing colour blindness, Europe

Shinobu Ishihara Biography - Japanese ophthalmologist (1879–1963

Color Blind Test, Test Your Color Vision

File:Ishihara 2a.svg - Wikimedia Commons

Color Blind Test, Test Your Color Vision

Ishihara color test

Tritanopia – Blue-Yellow Color Blindness – Colblindor