Book excerpt: This book is a comprehensive treatment of all facets of colour blindness. It looks at the causes of congenital colour deficiency, and acquired colour vision defects arising from ocular and general pathology or excessive use of therapeutic drugs. The design of clinical colour vision tests is fully explained and all the available tests documented. Detailed information is given on the optimum use of screening, classification and occupational tests. Examples of typical results in different types of deficiency are included, together with advice on the examination of children and disadvantaged groups. A checklist is provided of occupations requiring normal colour vision or in which defective colour vision is a handicap. This is a practical book, designed for students and all professionals engaged in colour vision screening, but pitched at a level that will also appeal to the non-specialist reader.