What is the Origin of Short-Wavelength Light Therapy?

This therapy is a direct clinical application of chronobiology, following the identification of melanopsin's peak sensitivity to blue light. The term 'therapy' distinguishes its intentional, timed use from casual light exposure, often employed to treat Seasonal Affective Disorder (SAD) or Delayed Sleep Phase Syndrome (DSPS).

What is the Mechanism of Short-Wavelength Light Therapy?

The light stimulates the melanopsin photopigment in the intrinsically photosensitive Retinal Ganglion Cells (ipRGCs), sending a potent signal via the retinohypothalamic tract to the Suprachiasmatic Nucleus (SCN). Timed exposure in the morning acts as a powerful zeitgeber, suppressing melatonin release and initiating the Cortisol Awakening Response, thereby advancing the circadian phase and promoting daytime alertness and cognitive function.

Short-Wavelength Light Therapy ∞ Area

Short-Wavelength Light Therapy

Meaning

Short-Wavelength Light Therapy is the therapeutic application of light predominantly in the blue and green regions of the visible spectrum, typically around 450-500 nanometers. This intervention is specifically utilized to target the non-visual photoreceptors to exert a powerful influence on the central circadian clock and acute neuroendocrine function. It is a precise tool for phase shifting and mood regulation.