Prevention: Keep devices further away from your eyes
As with protection against cancer-causing UV rays, there are ways to defend against the damage caused by blue light.
The first solution is preventative: Keep digital devices farther away from the eye. The “Inverse Square Law,” as it applies to light, states: “Energy twice as far from the source is spread over four times the area” or has one-fourth of the intensity.
Holding one’s cell phone two feet away from the face reduces blue-light exposure to one-over-two squared, or one-fourth of the original intensity. This doesn’t seem realistic given the small size of the screen and fonts. However, most people hold their devices too close to their face, typically right under their noses. Moving the device or sitting farther away from the device would reduce both eye strain and exposure to blue light.