Abstract
1. Assessment of the visible iris pigments for a given individual may serve as a reliable guide to many of his physiological as well as psychological characteristics.
2. The author's iris pigment scale which dynamically presents the iris colors from blue to deeply pigmented black is arranged in a spectrum-like continuum. This scale is presented in relation to human health and disease for the first time.
3. This frame of reference provides for a genetically determined guide to certain aspects of the basic selective reactivity of each individual to his environment in relation to the specific appearance of the iris pigment.
4. It is felt that the principle of individual reactivity may facilitate a more appropriate and efficient application and use of those chemical agents and therapeutic procedures already available.
5. Some aspects of the application of the iris pigment scale, as a new frame of reference, to the normal variants of temperament, the genetically determined mental deficiency and the schizophrenic process, have been delineated.