Certain kinds of autistic people avoid this and look at the line between the skin and hair or fixate on an ear instead. It can also detect certain kinds of schizophrenia. When following a moving target, our eyes generally move in a here smooth pattern. Certain schizophrenic people cannot do this and their eyes jump instead of moving smoothly. Thats because the smooth pursuit movement comes from the same part of the brain that is affected by schizophrenia.