This is the discipline of using various frequencies of light within the visible spectrum 400 to 700 nm to visually stimulate your ANS (Autonomic Nervous System) to induce “Syntony” ie - a balance between Sympathetic (catabolic - fight or flight state) & ParaSympathetic (anabolic - rest & digest state) of the ANS.  After a TBI / concussion, or any brain deficiency, symptoms such as headaches, double vision, dizziness, photophobia, depth perception & focussing problems etc. may be associated with the patient becoming 'stuck' in this high anxiety Sympathetic state.  Specific light frequencies can be used to transition the brain into the parasympathetic state to facilitate healing.  There are over 50 chromophores in our body that are sensitive to specific frequencies of light which activate this healing process.