Frequently Asked Questions

What is Syntonic Phototherapy? Syntonics or optometric phototherapy, is the branch of ocular science dealing with the application of selected light frequencies through the eyes. It has been used clinically for over 70 years in the field of optometry with continued success in the treatment of visual dysfunctions, including strabismus (eye turns), amblyopia (lazy eye), focusing and convergence problems, learning disorders, and the aftereffects of stress and trauma. In recent years, Syntonics has been shown to be effective in the treatment of brain injuries and emotional disorders.

What symptoms does Syntonic Phototherapy treat? Syntonics helps with blurred or fluctuating vision, lazy eye, double vision, eye strain or fatigue, reduced peripheral vision, light sensitivity and night vision difficulties. Also, it can treat visually related headaches, poor concentration, reading problems, poor coordination, depth perception issues, and reduced athletic or academic performance. In patients with history of stress related trauma, Syntonics is beneficial for the physical, mental, and emotional state of the patient.

How can I find an experienced Syntonics Practitioner? You can use our Locate a Practitioner Tool or contact home office at

When was the college established?  The College was established in 1933 by Dr. Harry Riley Spitler.

Where and when will the next ‘Annual Conference on Light and Vision’ be held from the College of Syntonic Optometry? Please visit the Events and Conferences page for more information.


Upcoming Events

91st International Conference on Light and Vision in St. Pete Beach, FL. Happening on May 15-18, 2024

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Patient Information

Our approach to evaluating and improving vision is based on the principle that vision is a learned process. Good vision is not just something we are born with. It must be developed.

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