Man, these are such tiny numbers I am super skeptical of the claims. Could it be we simply haven't seen a case yet? How many people are born blind? What fraction of the populace experiences schizophrenia? If we go by the damn numbers in the article, 1.6:50000 is schizophrenic over a very long time period. The sample size of 60 is absurdly tiny. 70 years is not a long time. 3 generations in which a miniscule fraction are born blind.