What is john andrews iridology? Who is John Andrews Iridology? John Andrews is the author of the latest Iridology textbook with Iris & Pupillary Signs, 3rd Edition – Modern Iridology. Plus he has written Endocrinology & Iridology, Iris & Pupillary Signs, 2nd Edition, Immunology & Iridology and Emotional Approaches in Iridology. He is co-author of Embryology & Iridology with Dr …