The first layer of Professional level training. Whereas Iridology Essentials deals with individual signs, the Constitution is about the collection of signs in the iris. Constitutional Iridology is the most valuable aspect of physical Iridology in that once understood, you can determine each person's inherent dispositions, their ideal diet, their primary nurture points and their personality traits. Integrated Iridology Module 2. Course pre-requisite: Integrated Iridology Essentials. Recommended preparation reading Chapters 5 and 6 of the Integrated Iridology textbook.