Iridology Diploma

Learn how iridology can make a huge contribution to any complementary practice
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A Message from the Author

I want to welcome you most warmly to the study of Iridology. ​​Students of our course have taken their knowledge out into the world of practice and ​they have been able to see more penetratingly into the health of their patients. They have seen many truths about causes and effects in health and disease - that is what allows you to understand those extra things that make you into an even better healer.

I think you are ​going to find this the most intriguing and absorbing study and, certainly, that is my sincere hope. As you precede, much of what you learn will amaze you and inspire wonder at the ways of the human body and mind. As you tread this very special road, I pass on to you the words that Bernard Jensen gave me years ago when I was his student, inscribed upon the inside cover of his book: “Seek the Higher Values in Life”.


Dr. Lawrence Plaskett
What is Iridology?

Iridology is the art of iris analysis. The iris is connected to the brain via the hypothalamus and can give naturopathic read outs on tissue conditions in various parts of the body. With training and practice it is possible to read signs indicative of biochemical, emotional and environmental influences that are hard to determine by other means. We can thus interpret health (and even aspects of personality) by close examination of the eyes, using suitable illumination and a magnifying glass.

The close relationship between naturopathic iridology as an assessment tool and nutritional therapy and other naturopathic disciplines continues and grows closer. Now Iridology can make a huge contribution to complementary therapeutic practice and enhanced by our wonderful digital collection of eye photographs, the learning process with the Plaskett International College is a profound and exciting one.

We teach Iridology quite separately from other topics and anyone who possesses, or expects to possess, a practitioner's qualification in any therapeutic discipline, may join the course.

Course Duration

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Study Hours

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Course Content

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Course Fee


How Can Iridology Help Practitioners?

Examples of how iridology can help practitioners

Did you know that some iris features are so very plain that you can see them with the naked eye in ordinary social contact? You can see from two or three feet away in many cases that the person has a toxic digestive system (a strong wide dark ring around the pupil margin). You can often tell that the person has an overactive stomach (a narrow bright white ring very close to the pupil). You can tell when the skin is overlaid with toxins so that the skin's function in excreting toxins from the body is jeopardised (very narrow dark ring around the iris margin). You can tell in some people (rather advanced cases) that they suffer badly from sodium and potassium imbalance and have placed themselves at potential risk from cholesterol accumulation (the so-called corneal arcus, a white or off-white cloudy deposit, usually fairly thick, around the iris margin). 

Another example is the ring of spots or 'tophi' represented by the lymphatic rosary. Its mere presence tells one that there is sluggishness in the lymphatic system. When these tophi are darkly pigmented, the situation gives rise to concern for the possible generation of lymphatic illness.

Using the precise positioning of iris reflex areas contained on the iris chart, one may distinguish many key points of analysis. Areas of stress and tension can be pinpointed by identifying 'contraction furrows’. Past injuries and adhesions show themselves as contortions of the normally regular and even iris fibres. You can answer questions like:-
Is it the pancreas or the liver that is responsible for the trouble? Is the patient's hypertension caused by a defect of or toxic deposits in the particular brain area that is geared to control blood pressure? One of Jensen's rather dramatic illustrations is of the iris of a man who has just been shot. It shows the precise areas of tissue damage within the body and the response is very fast.

The number of potential examples is almost without limit. The above may suffice to show the types of things that iridology can do for practitioners. We hope it will help you decide to study Iridology with the Plaskett International College.

Course Overview

The course covers the nature of iris observation, the nutritive zone, the iris chart, the chronic and acute, the intestinal and stomach zones and nerve collarette, the constitution type, respiratory system, lacunae, open lacuna, inherent weaknesses, the organs of elimination, other organs, special signs, complete diagnosis of a subject. The treatment of the topic follows the principles of Bernard Jensen in the USA.

Once the basics have been learnt, the course teachings then extend considerably by bringing in the work of Dorothy Hall and of Dr Josef Deck, both of which are the subject of a special presentation during the course. The published insights of Farida Sharan and Harri Wolf, while not separately presented, also influence the presentation of the course material. Both the Australian School, (Dorothy Hall) and the German School, (Dr Deck/Harri Wolf), offer an added dimension to the study and interpretation of the constitution.

  • Personality aspects & Constitutional Types

    The study focuses upon the different personality aspects, which show up in different constitutional types. Dorothy Hall gives insights into what contributes to various different types of personality and their emotional and mental responses and their pre-dispositions to health or disease. Different sorts of people can have different priorities, preferences and imperatives built into their very nature from or before birth, sometimes determining the course of their entire lives and their attitudes to the world and to other people.

  • An empathy between patient & practitioner

    The course teaches an understanding of these types and facilitates an empathy between patient and practitioner. It shows how people of the differing constitutional types are likely to go out of balance either mentally or emotionally and how their vulnerability to various physical ailments varies. The German School offers a very exciting and precise approach to the constitutional types, which is really quite different, but no less helpful. It highlights variations in the susceptibility to diseases of different organs and systems.

  • The 3 schools of thought

    It is a prime purpose of this course, not only to teach these differing positions, but also to demonstrate how it is that all three of these major schools of Iridology embody different aspects of the truth, how each is individually valuable and how a full and deep understanding of the meaning of 'constitution' can be gained through a sympathetic synthesis of the contributions from all three of these schools.

Breakdown of the Course Sections

In total there are 9 sections comprising of text, videos and iris images to study:

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Section 1


Areas Covered

  • Iris colour
  • Information that iridology can give us
  • The structure of the eye and the iris
  • Using the iris as an assessment tool
  • The principle of reflex areas
  • The Nutritive Zone
  • Abnormality in the colon
  • The Collarette (autonomic nerve wreath or anw)
  • Diagnosis of the constitution based upon fibre structure
  • Studies on images of real eyes
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Section 2


Areas Covered

  • The general layout of fibres outside the collarette
  • Inherent weaknesses
  • First stage in further deterioration of an inherent weakness
  • The meaning of darkness in the iris
  • The development of discrete – open lacunae
  • Lacunae
  • Further notes about lightness and darkness amongst the fibres
  • Healing lines
  • Crypts
  • Round the iris chart – the left iris
  • Round the iris chart – the right iris
  • Checking which structures and inside and which outside the collarette
  • The organ systems
  • The neural arc reflex
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Section 3

Special Signs

Areas covered

  • The corneal arcus (sodium ring, cholesterol ring, lipemic ring)
  • The tophi (also lymphatic tophi or lymphatic rosary)
  • Corneal Arcus
  • The anaemia sign
  • The catarrhal sign
  • Acidity
  • Grey background
  • Scurf rim
  • Circulatory ring
  • Sphincter muscle (also called pupillary sphincter)
  • Pigments (topastible or topolabile)
  • Psoric spots
  • Contrcation furrows
  • Radial furrows
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Section 4


Areas covered

  • Very resilient
  • Resilient average
  • Moderately resilient
  • Mildly resilient
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Section 5

More about white signs

Areas covered

  • Revision of distinctions between the different white signs
  • Pictures of irises with white signs, with commentaries
  • Further interpretation of the corneal arcus
  • Further interpretation of the lytophi
  • More general interpretation of the colour white
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Section 6


Areas Covered

  • Yellow pigment in the iris
  • Orange pigment
  • Brown pigment
  • Contraction furrows
  • Radial furrows
  • Psoric spots
  • Pupillary border
  • The “friendly fibrils” sign
  • Summary of remedies
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Section 7


Areas Covered

  • The German school of iridology
  • Our approach to teaching the German school
  • Introduction to the German constitutional types
  • The lymphatic constitutions
  • Mixed biliary constitution or biliary constitution
  • Haematogenic (or haematogenous) constitution
  • The way to use information on the German constitutions
  • New signs that are specific to the German school
  • Treatment recommendations for constitutional types
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Section 8

 advanced studies of the iris

Areas Covered

  • Further details of the iris chart – its layout and its implications
  • Neural arc reflex
  • Deformation of pupil shape and position
  • Advanced study of fibre separations, sinuosity, injuries & adhesions
  • Lacunae of different shape and appearance
  • The b3 bulge and the pterygium
  • Working with genetically brown eyes
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Section 9

 The consultation & the practicalities

Areas Covered

  • Diagnosing pathology of individual critical organs
  • Personality interpretations based upon the German school
  • Conducting an iridology consultation
  • Practical aspects of iris examination
  • Making drawings of the iris and recording the data
  • The uses, advantages and limitations of iris photography and its place in iridology practice
  • Equipments and techniques of iris photography
  • Using the computer to store and process digital images
  • The interaction of signs
  • Interpreting the whole iris in conjunction with the case study
  • Pointers to treatment
  • Carrying out case histories

Here's what students have to say about the course

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Dr Ezequiel Lafontaine, Iridologist

Puerto Rico

​"I LOVE IRIDOLOGY. I have over 30 iridology books, Italian, French, German, Spanish and English, plus over 4,000 photos from my own practice. ​I took this course for a refresher course and found the material was second to none."

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Mrs D. Moothy, Nutritional Therapist


​“The distance learning courses have given me the opportunity to pursue my dreams through a program that was not only flexible and convenient for my schedule, but was also challenging and rewarding. I thoroughly enjoyed the readings and the assignments but most importantly, I enjoyed being able to do things at my pace. I must say that the most exciting and challenging course was the Iridology Diploma, and I am happy that I was able to do well in all the courses.”


Emma Rubio, Health Coach


​"As a Health Coach I decided to pursue my studies with the Plaskett College to become a Nutritional Therapist. For that, I am also ​studying Iridology. I am happy to have a tutor to answer my doubts and I like the flexibility that the College offers me. I love the subject of Iridology and the way it is explained, I also like having some videos of Dr Plaskett teaching Iridology as I admire him."


Iridology Diploma

£495 or £88/month over 6 months

  • Lifetime Access to Course Material
  • Full Tutor Support
  • Diploma In Iridology upon Completion
  • Instalment Option Available


Yes.  As a guide, this course takes 9-12 months based on a part time study schedule of 3-5 hours per week however if you have more time to allocate to study, you can certainly complete the course sooner.

There are 2 case studies to complete.

You will be awarded a Diploma in Iridology which will entitle you to use the letters Dip.IRID. after your name.



Yes, it is accredited by the IICT (International Institute for Complementary Therapists).

If you would like a hard copy of the course material to complement your online studies, you can purchase this for £10 (p&p incl.)

The course is presented in a written format with supporting videos and digital images of iris 'signs' where appropriate.

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