Interactive visual eye test with optical movement

Link to the interactive Visual Eye Test : http://www.tagseoblog.de/interaktiver-sehtest - Find out how difficult seeing could be.
Nearly 9% of all men can not see as the rest. They have a color-Blindness. Mostly it is the red-green color-blindness. That means, they only see grey instead of these colors.
More about color-blindness: http://en.wikipedia.org/wiki/Colorblind

This interactive Flash-tool shows how hard seeing could be. Please try out and check color-test with optical movement and different background colors.