What we perceive as white light shifts along a range of about 2,700K to 7,000K. This effect is called color temperature and is measured in kelvin (K). For instance, the light coming from an incandescent LED light bulb is warmer than the light coming from a computer monitor. Depending on the lighting conditions and what is radiating and reflecting light, white light can appear very yellow (warm) or blue (cool) in color. There is no singular white, but a whole range of visible light that counts as white. Without going too far into the weeds, you simply need to understand one fact about light: The color white isn't universal.

That's not the full picture, though, and this is where light and color theory comes into play, along with concepts like color temperature, Planck's Constant, and the black body radiation curve. On the most basic level, blue light is exactly what it sounds like: light that's blue. Here's what you should know about blue light and some of your choices for reducing your exposure to it. But it's important to understand that you have lots of options for reducing eye strain when staring at screens beyond just getting new lenses. Maybe a pair of blue light blocking glasses even caught your attention. You've probably already heard of blue light and how it can hurt your eyes.

The more time we spend at home staring at screens, the more vulnerable we are to eye strain.

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Macbook blue light blocker