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Colour vision examination. A guide for occupational health providers. Guidance Notes are published under five subject headings: Medical. John Barbur developed the Colour Assessment and Diagnosis Test (CAD). The intellectual property rights for the CAD test are owned by City University. London and The City University Test was found to be the most reliable of the three screening tests used in this study for detecting congenital and acquired red green and/ 1. Ishihara Pseudo-isochromatic colour vision test plates. Introduction · 2. The City University test (TCU). Introduction · 3. Farnsworth D-15 colour vision test.The City University Test was designed to detect color confusions (i.e., Model I anomaloscope is considered a standard test of red-green color vision.