whats the difference between schitzophrenia and ignorance
What you said is quite valid :
schitzophrenics see what is not there and ignorant people dont see what is exhisting
Yet it should be added that ignorance is, relatively speaking,.........deliberate. While schitzophrenics are not conscient of what their doing or what is happening, and it surely is not on purpose.
Take for example the colours of a traffic light. The ignorant does not see the red light, red, because he wishes not to, and so wishes more to create an alternative reality, while the schitzophrenic has no choice and is not conscient of what is happening.