A text for specialists in orientation and mobility, providing background information on physiology and function of human perceptual and motor systems. A section on human systems addresses areas including low vision, kinesiology, and sensorimotor function, and a section on mobility systems deals with tools, materials, and techniques such as canes, electronic travel aids, trained dogs, and changes in the built environment that facilitate travel for blind people. A section on the learner focuses on approaches for teaching children, adults, and those with multiple impairments. A final section reviews development of the profession from the post WWII-era to the present, and looks at future trends. Includes b&w photos and learning activities. This edition incorporates changes in the field since 1980. Annotation c. by Book News, Inc., Portland, Or.