How does the blue light filter reduce strain on the eyes?

The blue light filter does two things:

  • decreases the amount of blue light
  • controls the PWM Flicker

Letโ€™s take a closer look at each one of these things.

Blue light

Before you ask why blue light is so bad, let me explain – NOT all blue light is bad light. Our Sun is the main source of blue light and it doesnโ€™t harm us. The blue light that comes from all kinds of digital devices is what harms us. It is the reason why you canโ€™t fall asleep at night.

PWM Flicker

I donโ€™t know if youโ€™ve heard about PWM Flicker before. If you havenโ€™t, hereโ€™s what your eyes look like when you sit in front of your PC:

Considering the fact that a blue light filter will solve both of these problems, for me it is a MUST.

The one I use is calledย Iris


  • blocks the blue light
  • controls the PWM flicker
  • controls the brightness
  • reminds me to take breaks once in a while
  • helps me work for hours