When sent to therapy it can be mistaken for eye conditions, even schizophrenia which if medication is taken regularly can cause schizophrenic tendencies
Richard Cytowic is the leading researcher and has spent his life learning about synesthesia and other rare brain conditions and making people aware of them
He is an opthamologist studying neuro-opthamology which focuses on eye conditions that originate in the brain as opposed to the eye
He has discovered that when having a synesthetic experience, there is decreased blood flow in areas of the cortex meaning these patients are not using their imaginations