Light is essential to life.
Our planet revolves around the sun and all life on earth is sustained by sunlight. The Greeks were the first to document the use of phototherapy. In optometry the use of phototherapy to treat visual dysfunctions is called syntonics. Interest in the effect of light on the body intensified earlier this century. Most of the current therapeutic techniques used insyntonics are based on the work fone by Dr. Harry Ridley Spitler in the 1920s and 1930s.