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1. Creamer Color Chart Screening test for the early detection of red-green colorblindness in children. http://colorblindtest.com
2. The Achromatopsia Group Internet resource center, support group, and discussion forum for people affected by the rare vision disorder. http://www.achromatopsia.org/
3. Vischeck See the world as color blind people see it. Can also simulate the effects of distance or different monitor types. http://www.vischeck.com
