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

Let’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 doesn’t harm us. The blue light that comes from all kinds of digital devices is what harms us. It is the reason why you can’t fall asleep at night.

PWM Flicker

I don’t know if you’ve heard about PWM Flicker before. If you haven’t, here’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 called 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