On average, we spend 50 hours a week on smartphones and tablets, in front of computer screens and TV screens or playing video games. All these screens have the latest generation LED backlighting and emit so-called "blue light" also known as HEV (high energy visible) lights. Blue light is almost as dangerous as UV light and can cause in the short term, headaches and sore eyes; in the long term, irreversible eye damage. IZIPZI's screen range filters out 40% of the blue light emitted by the screens.. They're stylish too!