Dr. Malini Varshney, O.D.

Absorption of blue light, at wavelengths below 430 nm greatly increases the potential for oxidative damage.  For blue-light circadian therapy, harm is minimized by employing blue light at the near-green end of the blue spectrum. The action spectrum of light-sensitive retinal ganglion cells was found to peak at approximately 450 nm, a range with lower damage potential, yet not completely outside the damaging range.