Show X axx 2 many persons unable to distinguish colors it I 1 a curious fact that lolor blind persons are not often aware of their defect of vision avea scientific men frequently fall to detect this defect in themselves the following Is a favorite theory to account for the cause of color blindness the eye Is of tour color blue yel low red and green these ailbe how ever from only two sources each of which has a bouble action producing the of two complementary colors one of the sources of sensa alon corresponds to blue and yellow the other to red and green mot col or blind people are deficient in the latter source of sensation and can distinguish therefore only blue and yellow with their compounds but sometimes the reverse a the anse the number of persons afflicted la to o 0 this way Is much larger than Is commonly the average Is said to be one in every 25 men women are rarely troubled with colo blind ness |