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f.lux is a tiny software that acts as a blue light filter for your PC. It adds a filter to the Display to remove the Blue Rays which are harmful for the eyes. Most of you may be familiar with a blue light filter app and what it does. But those who dont't know, basically a blue light filter app filters all the harmful blue rays from the Display screen. We spend hours in front of our PC resulting in our eyes getting stressed by the harmful blue rays. These rays also have many bad effects on our health like headaches and disturbed sleep cycles. So, it is highly recommended to use f.lux while using PC. It is a smart program and has many useful features for our eye care.