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".
|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.
|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.
|Back to Optical
Other fun stuff:
Free 3D Screensavers
Dimensions of Color
3D Color Puzzle