What is iridology zones dark spot Psora Spots? Location: Any location of the iris; Appearance: Various shades of brown or black spots; Symptoms: It indicates accumulations of toxins and is often an inherited weakness. How to read iridology color? Blue-Eyed Type (German:  Lymphatic) Description-White collaret (autonomic nerve wreath), solid blue or gray/blue color with no discoloration or psora (pigments).  Related …