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第三色覚異常（青黄色盲）

青感受性錐体細胞の欠如による稀な青黄色覚障害で、青と黄色の識別が困難になる。

Tritanopia affects fewer than 0.01% of the population and is equally common in males and females (unlike red-green deficiencies, which are X-linked). People with tritanopia lack S-cone (short wavelength, blue-sensitive) photoreceptors, causing blue to appear greenish and yellow to appear pinkish. Purple and blue become difficult to distinguish, as do yellow and white. While rare, tritanopia can be acquired through aging, retinal disease, or medication side effects. Designing for tritanopia means avoiding blue-yellow as the sole color distinction and ensuring sufficient luminance contrast.

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コントラストチェッカー

WCAG 2.1ガイドラインに基づいてカラーコントラスト比を確認します。通常テキストと大きなテキストのAA・AAA準拠をテストします。