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Color Blindness

Almost 10% of human males experience color vision deficiency (compared with 0.4% of females). The most common form of these abnormalities is characterized by an inability to distinguish between red and green hues.

Instructions: The following images are part of The Series of Plates Designed as a Test for Colour-Deficiency by Shinobu Ishihara M.D. which is the accepted standardized color blindness test. They are specially adjusted to isolate the exact deficiency experienced by the viewer. What do you see in the plates?

This is a test plate in which everyone should see a "12". Color Blindess Control
This plate is designed to separate the type of color defectives and the level to which they are observed. Most will see the number "26" clearly while some will only see a "2" or a "6" or no numerals at all. Color Blindness Check
Can you trace a line from one "X" to the other? Someone with normal color vision will trace a orange/brown purple line and those with a slight deficiency will follow a different path. Color Blindness Confirm
Back to Optical Illusions

Other Illusions:
Blind Spots
Blink Effect
Bordering
Chromatic Adaptation
Chromatic Adaptation
Color Blindness
Crispening
Dither Dots
Dithering
Fill Patterns
Opponent After-images
Optical Art
Shape Contrast
Simultaneous Contrast
Simultaneous Contrast
Value Contrast

Other fun stuff:
Free 3D Screensavers
Color Playground
Dimensions of Color
3D Color Puzzle

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