This book provides the first general and unified theory of visual discomfort. Based on the author's observation that people find certain visual stimuli uncomfortable--and that these same stimuli induce seizures in patients with photosensitive epilepsy--the book offers fascinating insights into a variety of visual stresses that arise from design, reading, lighting, television, and VDU terminals. A range of techniques for preventing and treating visual discomfort--from color therapy to precision tinting of spectacle lenses--are described in detail. Students and researchers in p