Why Are People Born Blind

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Why are people born blind. The parents pass on a gene that causes it. Why baby born blind. Can a person born blind still experience visual hallucinations. Since the middle of the last century researchers have been looking at a curious link it seems that being born blind protects people from developing schizophrenia.
You cant explain colors and most blind people become blind after birth so they have an idea of how colors look like. Why not marry to cousin. Danish research in 2014 found that as time passes a blind person is less likely to dream in pictures. Generally there are three causes.
Very few were born blind. Being born blind appears to somehow protect people from getting schizophrenia. What happens if someone was. Are people born blind.
Now a large scale study has just added more evidence to confirm this is indeed the case. If you were born blind what do you actually see. 29 january 2019. He points out that people who were born blind are particularly adept at things like selective attention something at which people with schizophrenia often struggle.
Something chemical perhaps affects the fetus during development. Or do they go blind when they are older. Is there anything that would cause someone to be born totally blind without other disabilities.