This text provides invaluable information for practitioners involved in the examination of colour vision. The information is largely practical with sufficient theoretical background for explanation and credence. The style is fluid and the organisation is clear and logical. As a clinical reference tool, the practitioner can directly access information for patients with colour deficiencies on the occupational consequences of colour vision anomalies. These have been graded into careers requiring normal colour vision, and careers where colour deficiency is a disadvantage. The disadvantages can range from exclusion from matching tasks of small and large colour differences to exclusion from all colour recognition tasks. Problems with colour codes and driving are discussed.