How the world looks to a person with a red/green
color deficit (deuteranopia).
How the world looks to a person with a
blue/yellow color deficit (tritanopia).
Some colorful hats.
As seen by a person with deuteranopia.
As seen by a person
with protanopia, another form of red/green deficit.
This is an Ishihara plate commonly used to check
for red/green color blindness
This is what a red/green color-blind person
might see. Note that the digit (3) is practically
invisible.
People with color deficiencies may have
difficulty distinguishing certain colors (e.g., a red/green
color deficiency means that reds and greens are more difficult
to distinguish). But as this photo demonstrates, many other
colors are just as distinguishable to a person with a color
deficiency as to someone with normal color vision.
