Sorry, Apple: This Screen Protector Cuts Out Blue Light and Keeps Display Color Intact
'If you use your phone or tablet at night as much as most people, then you’re probably used to struggling to get to sleep. Studies show that staring at screens during the night can trick the brain into thinking its not yet time to sleep because of the amount of blue light the device’s screens emit.
So what can you do to change this? Obviously not using your phone at night is out of the question. Thankfully, there’s a way to seriously cut down on the blue light that your eyes see while using your phone. It’s called Ocushield.'
You can read more here.