What is iridology? Iridology is based on the scientific study of the iris, the colored part of the eye. Like markings on a map, the iris reveals physiological conditions, psychological health risks, challenges and/or strengths of various organs, and personality traits. Holistic Iridologist, David Pesek, PhD, is heralded as “The New Pioneer in Iridology.” I have been looking forward to this day… Dr. Pesek will share my personal iridology results on the air.