Dr. Chula Lerdvoratavee shares her expertise in syntonic phototherapy. She is a developmental optometrist in Oswego, Illinois as well as provider of syntonic equipment through SYntonac International, LLC.

Resources for finding a provider of syntonic phototherapy:

College of Syntonic Optometry: https://csovision.org/find-a-practitioner/

SYntonac International, LLC: https://www.syntonac.com/details/