I experienced a flash of light when using tDCS. Is this harmful?

These flashes of light are quite common when using transcranial electrical stimulation, and are known as phosphenes. Usually this will happen when an electrode is placed near the eye, and is a result of current running across optic nerves. While it may seem scary at first, this phenomenon has been recognized and studied by the scientific community and is understood to be a harmless side-effect of tDCS. Phosphenes can be reduced or even prevented completely by moving the electrodes further away from the eyes. More can be read about TES and Phosphenes in this PubMed Article.

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The Brain Stimulator tDCS products are not medical devices and therefore have not been reviewed or approved by the FDA. The Brain Stimulator Inc. does not claim to diagnose, assist, treat, improve, cure, or prevent any medical condition or ailment whatsoever. The Brain Stimulator Inc. does not make any claims or recommendations with the sale of their products. You should not use Transcranial Direct Current Stimulation (tDCS) if you have any metal or electrical implants such as a pacemaker, or if you have a history of seizures. Do not use tDCS unless you have a firm understanding of the technology, and have spoken with your primary care physician regarding any risks or concerns. By using this website you agree that you understand and agree to these terms and conditions as well as our privacy policy