This is a diagnostic tool, which is used to interpret underlying strengths and weaknesses in the constitution of the person. A valuable insight can be drawn from the information from the iris. Inherited weaknesses the person is born with can be highlighted, and this information can then be used in the treatment of the person.

Iris diagnosis can give further supportive information in the treatment of the individual. Changes within the iris can be seen, as treatment protocols are used. The health of the body is then reflected in the iris, and as the body's health improves, this is then indicated in the positive changes of the iris.