Ishihara-inspired plates to screen for red-green and blue-yellow color vision deficiencies. Identify the hidden number in each plate.
Color vision deficiency affects about 8% of men and 0.5% of women worldwide.
The most common type (Protanopia/Deuteranopia). Difficulty distinguishing reds from greens. Often inherited on the X chromosome, affecting ~8% of males.
Subtypes: Protanomaly (reduced red), Deuteranomaly (reduced green — most common of all).
Less common (Tritanopia/Tritanomaly). Difficulty distinguishing blues from yellows. Affects males and females equally — about 1 in 10,000 people.
Can be acquired: Sometimes develops with age, optic nerve disease, or certain medications.
Achromatopsia — seeing only in shades of gray — is extremely rare (1 in 30,000). Usually accompanied by light sensitivity and reduced visual acuity.
Note: Most "color blind" people see color — just a reduced or shifted palette.
This is a screening tool only — not a clinical diagnosis. Accuracy depends on your screen's color calibration. For a definitive assessment, please consult Dr. Khilar for professional testing (Farnsworth D-15, anomaloscope).