color blindness test

references:

http://fa.wikipedia.org
http://www.allaboutvision.com/conditions/colordeficiency.htm
http://www.colourblindawareness.org/colour-blindness
http://www.colormatters.com/color-and-vision/what-is-color-blindness
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001997
http://www.toledo-bend.com/colorblind/Ishihara.asp