Warning: iridology scientific evidence? Herbalist Michael Tierra has described how he became disillusioned with iridology. After making various observations, he stopped using it but still hoped that it would turn out to have some value. Then, however: A younger colleague fully equipped with the most up-to-date specialized iridology equipment introduced himself and stated that he wanted to give iridology …

What is iridology? There are many medical pseudosciences that persist despite a utter lack of either plausibility or evidence for efficacy. Some practices emerged out of their culture of origin, or out of the prevailing ideas of a pre-scientific age, while others were manufactured out of the imagination of perhaps well-meaning but highly misguided individual practitioners. They were just made up …