- March 2016: Apple just released a new feature for people with low vision & those of us who want to prevent it. Research shows that blue light from various sources (see below for more info) can adversely affect our vision. Also, there is some evidence that the blue light from our mobile devices when used at night will make it more difficult to fall asleep. The new feature called Night Shift allows you to adjust the screen on your iPhone so that it is ‘warmer’. Read more about it. You need to update your iPhone’s IOS to at least 9.3 first.