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Color blindness affects roughly 350 million people worldwide, and a color combination that passes WCAG AA contrast requirements (4.64:1) can become completely inaccessible for users with color vision deficiencies. Using the Colorblindly Chrome extension, the post demonstrates how deuteranopia, protanopia, tritanopia, and achromatopsia each dramatically reduce perceived contrast ratios—sometimes to as low as 1.4:1. To address this, WCAG suggests a 7:1 contrast ratio as a threshold that compensates for color deficiency, and recommends never relying on color alone to convey information. Practical tools like contrast checkers and color blindness simulators are highlighted, alongside the importance of user testing with people who have color vision deficiencies.