Definition Iridologist [n. iridologist < iridology] Practitioner iridology. In Germany irisdiagnostics became popular because of pastor Emanuel Felke (1856-1926).* Other German iridologists were Prof. dr. Rudolf Schnabel (1882-1952), Dr. Walter Lang and Josef Deck who demonstrated the clinical reliability of iridology; this could be the reason that in Germany iridology is widely accepted and known Iridology [n. iridology \ astrology …