late in life due to neurological injury such as stroke, while dyscalculia is a specific developmental disorder first observed during the acquisition of mathematical knowledge.Further links and references: Wikipedia: <a href="http://en.wikipedia.org/wiki/AcalculiaAchromatopsiaWikipedia">http://en.wikipedia.org/wiki/AcalculiaAchromatopsiaWikipedia</a> Description: Typically refers to an autosomal recessive congenital color vision disorder, the inability to perceive colo