This paper describes the perceptual and physical ergonomic problems inherent in attempting to control glare created by reflections on computer display screens. Several commonly used techniques to control glare are described, including their advantages and disadvantages. Methods to solve this problem through environmental and display housing design are discussed. The effects of glare control treatments on visual discomfort, operator performance, image quality and operator preferences are presented. Finally, the requirements of special applications are listed to demonstrate the need for continued research to solve not only the current problems with glare, but those of the future as well.