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What is Iridology?

Updated: Jan 22, 2025

Iridology or Iris diagnosis as it is sometimes referred to, is the observation and diagnosis of disease in the body from the iris, pupil tonus, Collarette, inner pupillary boarder, pigmentation markings and Sclera (whites of the eyes).

From iris diagnosis we are able to tell which constitutional (Genotype) type of the patient. The 3 main constitutions are; Lymphatic (Blue iris), Haematogenic (brown iris) and Mixed (Biliary) which is a combination of the blue and brown irises. From a Patients constitutional (Genotype) we are able to see the disposition and diathesis of the patient, which are an invaluable source of information for both the patient and the practitioner. The Constitution gives us the basic information about the patient's genetically inherited conditions (Genotype), the Disposition type; the structural weaknesses which can predispose the patient to certain diseases. And the Diathesis, which through regulatory genetic factors and accumulations or deposits that can lead to diseases or allergies. The Diathesis can be either inherited (Genotype) or acquired (Phenotype) and it can be active or dormant.

Or simply put; Basic Constitutional Type (Genotype) + Disposition (structural gene) + Diathesis (regulatory gene) = Patient's unique Constitution

And from the patient's unique Constitution we can build a treatment plan to aid the patient back to health and well being.



The observation of changes in and around the eyes is very old. References to this can be found in Chinese medicine approximately 2000 years ago.

And also in the works of Hippocrates references to the eyes and diseases can be found.

In 1670 Philippus Meyens in his book Chiromatica medica mentions markings in the iris and their interpretation. In 1786 Christian Haertels published his dissertation titled "The eye and its signs". Then in 1881 Dr Ignatz von peczely published his work; Discoveries in the field of natural science and medicine: instruction in the study of diagnosis from the eye.

In 1887 Ophthalmologist Schlegel wrote a book supporting iris diagnosis, entitled; The eye diagnosis of I.v. Peczely.

In 1893 Pastor Liljequist published his work entitled Om Oegendiagnosen, which built on and greatly improved the previous work of Dr Peczely.

From 1896 to 1925 Pastor Felke is credited with expanding the field of iris diagnosis, he influenced the development of this field through his various students.

A. Müller wrote a book entitled; The Eye diagnosis based upon the principles of Pastor Felke.

More recently a true pioneer in the field Dr Josef Deck wrote extensively on iridology from 1955, 56, 65, 75 and 82. His last work was Differentiation of iris markings, differential diagnosis textbook 2.

In 1977 and 1984 Josef Angerer wrote 3 important works on iridology.

In 1984 H.W. Schimmel wrote Constitution and disposition from the eye, which is still a reference book today.

There are many more researchers worthy of mention who have, or who have expanded the field of iridology, the likes of Dr. B. Jensen, Prof H.W. Schmidt, Dr. Schnabel, Dr. Unger, H.F Herget, R. Stolz, G. Lindermann, Dr. D. Pesek, H. Wolf, W. Hauser, Josef Karl, Dr. D Lo Rito and Mr J Andrews who has written excellent books on modern iridology.


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