For the record, I studied with Bernard Jensen and knew him personally for nearly 20 years. He was my friend and mentor. I have the greatest respect for his generosity. He taught all his students everything he knew. This is an attitude I have adopted towards my own students over the last 36 years I have been teaching. One truth in all specialty subjects is that we need to stay current. Bernard gave us a fabulous foundation on which to build. Some of his teachings were not only way ahead of his time, but have been recently popularized by authors and teachers as if this material is brand new (the fact that he taught that our food should be comprised of rainbow colours to optimize nutritional value).
Getting back to Iridology - there are a couple of glaring examples where updates of Jensen teachings have been necessary so that our understanding runs in line with physiology and also with research.
We have to make sure that our belief is backed by fact. Research has demonstrated that less than five percent of children have pigments but more than eighty percent of adults display this feature in the iris. This suggests that iris pigment is accumulative. (Page 205 Integrated Iridology Textbook). For over 20 years I have asked pigment removal claimants for photographic proof. Images that were produced were found to have used different lighting systems, camera types or photo paper (which varies according to brand and RGB values at photo labs).
On the other hand, I have photo proof through my own research of pigment development in some of my clients. Some of whom I have been seeing since birth.