Charts and diagrams indicating areas of blindness in people with visual impairment. Visual areas are indicated on a model of the human brain. Simple animation of the parietal area of the brain. Study to assess damage to the parietal area which may affect the ability to get from one place to another. A man holds a chart with a line marked between dots. The man tries to follow the mapped route on a laboratory floor with marked dots. An examiner traces his progress.