There are cases of congenitally blind people who developed schizophrenia. The important observation is that they are all of a specific type in terms of origin of the visual deficit. I am one of the authors of the original study in Frontiers in Human Neuroscience (the study that Mind Hacks presents) and this is one of the crucial points raised in the study. You can read more about it here http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00940/abstract. Thank you for your interesting comments on this topic.