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I just wanted to let you know I think your site is awesome. As a high school student, I've never really told anyone that I was colourblind - until it was brought up in a biology class. Being the curious folks, high school students are, I was bombarded by 'what colour is this, what colour is this?' and 'what *can* you see?'. Thanks to your site, I can actually show them what it's like to be colourblind, plus explaining some facts to me. Just wanted to show my appreciation,
-Paul F.
 
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Color Vision Simulator Examples

Vischeck's color vision model allows you to simulate how the world looks to people with various sorts of color deficiency. As you can see from these examples, 'color blindness' is really a misnomer- most 'color blind' people do in fact see colors! The colors seen may be different than those seen by someone with normal color vision. Also, people with color deficiencies may see certain colors (like red and green) as very similar, while someone with normal color vision sees them as quite dissimilar. (Complete color blindness does occur, but is quite rare.)

For more information on color deficiencies, see Alex Wade's recent article from Planet Medica.

The world.

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).

earth from 
space image earth, 
deuteranope earth, 
tritanope

Some colorful hats.

As seen by a person with deuteranopia.

As seen by a person with protanopia, another form of red/green deficit.
hats 
image hats, deuteranope hats, protanope

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.

original image as 
seen by a deuteranope

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.

Poppies and cyclamen.

Protanope.

Tritanope.

poppies: 
original image protanope poppies tritanope poppies


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