Red light intervention improves visual function threshold by about 20% across the population.

“If you look over the population, the size of the effect is around 20%. It's very substantial. Okay. But the our ability to improve visual function varies enormously between individuals.”

“And the real big point to take on board is it's a switch. There's not a dose response curve here. It is a you put enough energy in at a certain wavelength of light and it goes bang and click and then 5 days later goes chunk and stops.”