Some form of iris analysis has been practiced for 3,000 years. It is utilized in the healthcare practices in technologically developed nations as well as developing nations worldwide.
In the early part of the 20th century, iridology was practiced and advanced by medical doctors. Please read the following quote:
“The ‘regular’ school of medicine, as a body, has ignored and will ignore this science, because it discloses the fallacy of their favorite theories and practices and because it reveals unmistakably the direful results of chronic drug poisoning and ill-advised operations.” — Henry Lindlahr, M.D. ~ Circa 1919
Attempts to discredit iridology have been made by trying to fit it into the conventional allopathic medical model. In this biased attempt, the fundamental principles of iridology have been ignored. Proper clinical use of iridology is for the assessment of predispositions from genetic factors. As an example, a trained professional iridologist can see a weak kidney or heart in that iris reflex area long before the individual ever has any signs of a health issue. This is a naturopathic approach to health, and thus, illness prevention. The present day, mainstream, conventional, allopathic medical system is based on treating and suppressing symptoms, not prevention.
The good news is that many open-minded, caring and intelligent medical doctors are beginning to realize the benefits of iridology and preventive healthcare.
Two nations that are well known for their science and technology are Germany and Russia. Iridology has been openly researched and practiced by medical doctors for over a century in Germany and since the end of World War II in Russia.