- High energy wavelengths (blue and violet) activate the parasympathetic nervous system, which is responsible for resting behaviors
- UV light has been found to help decrease blood sugar level, destroy toxins, kill bacteria, and help stabilize cell function in blood
- Activation of the parasympathetic system allows for the contraction of pupils, decrease of tearing and intraocular pressure, and lowering pulse and blood pressure.
- Example: exophoria - a common issue in which an individual with brain trauma cannot control the location of their pupils (eyes drift on their own) after head trauma, which is primarily caused by activation of the sympathetic system. By activating the parasympathetic system, this effect can actually go away

University of Colorado at Boulder

- Sympathetic Phototherapy
- Parasympathetic Phototherapy

Types of Syntonic Phototherapy

Wallace, L. B. (2009). The Theory and Practice of Syntonic Phototherapy: A Review. 


The Theory and Practice of Syntonic Phototherapy: A Review

Parasympathetic Phototherapy

- Low energy wavelengths (red, orange, and yellow) activate the sympathetic nervous system
- Activation of the sympathetic nervous system allows for the dilation of pupils, increased intraocular pressure, and decreased accommodation on lenses
- Can be used to reverse parasympathetic effects on brain trauma

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