Participants in the experiment were between ages 34 and 70, both female and male. While one group was exposed to red light for 3 minutes in the morning, the other had the session in the afternoon. Their eyesight was measured via a test of their ability to differentiate between colors 3 hours after the session, and again a week later. The group who had the morning red light session showed an average improvement of 17% in their color contrast vision.
The afternoon group showed no results. The researcher's hypothesis as to why this happens is that the mitochondria in the retinal cells may follow the body's circadian rhythms, as Prof. Jeffery explains. The research team can state with confidence that the optimal duration for a red light session is 3 minutes and that the results will last for a week.
The exposure session was conducted as follows: the light used came from a commercial flashlight with 9 LEDs "mounted behind a light diffuser [...] light was delivered down a white internally reflecting tube that fitted over the eye with an internal diameter of 3.2 cm" (1.2'')."
Devices of that specific wavelength are available to purchase online, but we would suggest a vigorous search for a trustworthy source.
Source: Medical News Today
