The Syntonic Principle

By Harry Riley Spitler, D.O.S., M.D., M.S., Ph.D.
Considered the “father of syntonic optometry,” Spitler presents a thorough treatise on the role of light and color in the overall function and development of the human organism, and, more specifically, on the function of vision. First written in 1941 and reprinted by the College of Syntonic Optometry in 1990, The Syntonic Principle remains a relevant and cogent tool for optometrists seeking to understand the biological and visual effects of light. Softbound, 217 pages.