When you enable the blue light filter on your iPhone or iPad (or for that matter any smartphone or tablet) it is supposed to improve your circadian cycle. This is what happens:
Gadgets like iPhones and iPads constantly emit a sort of a blue light – it doesn’t seem blue to your eyes, but it is the same blue light emitted by the sun, so unless there is lots of blue light coming from your iPhone or iPad, you won’t be able to view the information on the screen.
While the blue light helps you read the screen during day when there is lots of sun, in the evening and at night, there is no need for the blue light. The sun is down and there is no competing blue light from the sun. This is the time you can enable the blue light filter on your iPhone or iPad.
Why enable the blue light filter on your iPhone or iPad? For millions of years our eyes have learned that lots of blue light means it’s daytime and when it’s daytime, there is no need to go to sleep. In olden times your body would naturally feel sleepy after sunset. This doesn’t happen these days because we have electricity and we also watch lots of TV and spend lots of time in front of computers and with our gadgets like iPhones and iPads. This is disturbing our sleeping pattern and is having a negative impact on our health and contributing to something called computer vision syndrome.
As it happens with most of the Apple devices, some of the most fundamental features come to them when the rest of the world has been using those features for a few years. Android users have already been using the blue light filter through various Android apps for many years.
Apple introduced the blue light filter – a feature called Night Shift – with iOS 9.3. Once you are able to install and activate your device after upgrading to iOS 9.3, it is very easy to enable blue light filter, or activate Night Shift on your iPhone or iPad.
Enable blue light filtering on your iPhone or iPad:
- Go to Settings of your iPhone or iPad
- Go to Display & Brightness
- In this section you will find the option to switch on the Night Shift feature – this feature filters out the blue light that disturbs your sleeping pattern
The problem with turning on the blue light filter in iOS 9.3 is that when you turn it on it turns off the Low Power Mode. How can you enable blue light filtering (Night Shift) and Low Power Mode at the same time? Low Power Mode, as the names suggests, helps you save battery.
Here is a video that explains how, using Siri, you can turn on blue light filtering in your iPhone or iPad along with keeping Low Power Mode on (requires iOS 9.3 and above):