Iridology is the study and interpretation of patterns in the human iris as indicator of individual characteristics. Conventional Iridology seeks to identify both specific and general conditions of various organ systems in the body. A related field of inquiry, which studies the behavioral and personality interpretation from the iris is Rayid, a system of analysis whose methodology is distinct and separate from conventional Iridology. Rayid includes non-iris body factors and is associated with a range of specific natural healing methods. More recently the differences are diminishing as Iridologists are studying personality factors in the constitution and Rayid practitioners are identifying body factors with views beyond the iris. Together Iridology and Rayid are interpretive models for identifying individual traits from patterns in the iris.