The Auragen System should always be used with eyes closed. Eyeshields are NOT necessary and even not recommended. The vast majority of customers never use eyeshields during a session.  Some of these customers have been using our technology daily for almost a decade.  The wavelengths utilized by Auragen are completely safe.*  *see precautionsAdditionally, the Gamma and Theta light entrainment will be neutralized with eyeshields. Covering the eyes lessens some of the wonderful benefits of bioactive light reaching the eyes and brain. The eyeshields are available for purchase to provide additional comfort only if needed as a user is getting acclimated. Face, hands, and feet have the most capillaries and therefore absorb more light.  Users can also get a systemic Photobiomodulation effect from exposing hands or feet, instead of the face during a session. However, Gamma and Theta entrainment only work with the canopy over the face and the eyes not shielded.