aDesigner from IBM has a color-blind simulation tool. Below is a screen
shot of the setting and preview simulation. I have used it effectively
with non-color-blind individuals to show them what the color-blind persons
might see. The tool also lets you set the eyesight from 20/20 to 20/40
etc. and change the Crystalline aging effect as well.
[screen shot from aDesigner]
you can evaluate yourself it for free or now purchase a license for $100
U.S. at http://www.alphaworks.ibm.com/tech/aDesigner
Regards,
Phill Jenkins
IBM Worldwide Accessibility Center
http://www.ibm.com/able