Colour deficiency test

Colour-deficiency test

Write down the number you see in each of the circles above. Click here for the answers.

Colour deficiency (sometimes called "colour blindness") is a sex-linked condition characterized by inability to distinguish shades of red (~75% of cases) or green (<25% of cases). This is in turn due to either a shift in the range of wavelengths of light perceived as red or green (anomalous trichromaticity), or an absence of red or green opsin pigments in the cone cells in the eye (dichromaticity). A small number of cases involve autosomally-linked blue deficiency, or monochromacity, which is inability to see colour at all. (For details, see OMIM303800).

From the Agape Optomtery Center website:

Trichromat
Regular vision is Trichromatic - it uses all three color pigments (red/green/blue).
Anomalous Trichromat (6.3% of males and 0.37% of females)
    People with Anomalous Trichromatic vision use all three color receptors but reception of one pigment is misaligned.
            Protanomaly: reduced red sensitivity (L or long wavelength cone cell defect). 1.3% of males and 0.02% of females
            Deuteranomaly: reduced green sensitivity (M for middle cone cell defect). 5% of males and 0.35% of females
            Tritanomaly: reduced blue sensitivity (S for short cone cell defect). 0.0001% of males and 0.0001% of females
Dichromat (2.4% of males and 0.3% of females)
    People with Dichromatic vision use only 2 of the 3 visual pigments - red, green or blue is missing.
            Protanopia: unable to receive red (L cone cell absent). 1.3% of males and 0.02% of females
            Deuteranopia: unable to receive green (M cone cell absent). 1.2% of males and 0.01% of females
            Tritanopia: unable to receive blue (S cone cell absent). 0.01% of males and 0.03% of females
Monochromat (Achromatopsia - 0.00001% of males and females)
    People with Monochromatic vision can only see one color, so their vision contains no 'color'.
        Typical Monochromatic: unable to combine colors. Fully grayscale. Also known as Rod Monochromat.
        Atypical Monochromatic: very low color recognition. Also known as Cone Monochromat.