As a developer I can easily spend 12 hours a day in front of a screen (Laptop, phone, tablet, TV). I try to follow the 20-20-20 rule (http://lifehacker.com/5591835/reduce-computer-caused-eye-strain-with-the-20-20-20-rule).But sometimes it's just not possible to stop working and look at the wall for 20 seconds. How do you take care of your vision?