Computer eye strain is a significant problem for people who frequently use electronic devices. Researchers warn that prolonged exposure to devices with LED screens can irreversibly harm the retina. The retina is the light-sensitive layer at the back of your eyes. The culprit is “blue light” that is emitted from modern technology, which can cause sleep disturbances, headaches and even blindness.
f.Lux on Your Jailbroken iPhone or iPad
Thankfully there are tweaks you can use to limit the brightness of your iPhone or iPad. If you want to change the display colors on your jailbroken devices to warmer, safer tones, the f.lux tweak by Cydia will make a difference. On your jailbroken phone or tablet, open up Cydia and search for f.lux. (Make sure you search using the period in f.lux). No repo is needed because f.lux is hosted on Saurik’s repo. Once the installation is done, you can use f.lux right away. The settings menu lets you select your display and turn off the light that reflects back into your face at night. The most noticeable change is that your device will not longer have the bluish tones that hurt your eyes, especially in the dark.
Accessibility Settings for Non-Jailbroken Devices
If you don’t have a jailbroken device, you can still tweak the display. Your iOS’s Accessibility Settings feature actually has some options for adjusting and changing the light display. I recommend working with them to see what works best for your eyes.
You can turn on Low Light mode to reduce the display brightness. This will make a big change in how you read in low light, but it will not have any impact on how the screen looks during the day.
How to Turn on Low Light Mode
Start by going to your iOS device’s home screen. Chose Settings, then select General. From the General screen, select Accessibility. You will then be asked whether or not to enable Zoom. The first thing that will happen is a zoom window popping up on the screen. Just ignore the zoom window. Triple-tap the screen with three fingers, which will bring up the zoom menu.
Next, tap Full Screen Zoom one time. Then select the Choose Filter option. From there, choose Low Light. Then return to Accessibility menu. Select the Accessibility shortcut option, then tap the Zoom option. Now you have a device that is has less blue light, which should resolve the brightness problem
Upgrade to iBooks for iOS
If you read using iBooks, the app has new enhancements to protect your eyes. The newest version of iBooks for iOS has three different themes that change the background and fonts to black, sepia and white. While white is the default mode, you can change the app to switch to the Night theme when it is dark. This will help nighttime readers save their eyes. The Auto-Night theme is a switch that turns on depending on ambient lighting conditions, not time of day. If you have Auto-Night Theme enabled, any time your iPad or iPhone detects darkness it will switch on. If light returns, such as when someone turns on a light, the Auto-Night theme will simply turn off.