The truth is, there is no good evidence that staring at a computer will cause permanent eye damage. However, computers can cause many uncomfortable eye-related symptoms such as eyestrain, dry eyes, headache, fatigue, difficulty focusing, blurred vision, and shoulder and neck pain. Digital eye strain is the physical discomfort felt after two or more hours in front of a digital screen and is associated with the close to mid-range distance of digital screens, including desktop and laptop computers, tablets, e-readers and cell phones.Computer vision syndrome (CVS) is a temporary condition resulting from focusing the eyes on a computer display for protracted, uninterrupted periods of time. Stress can also cause blurred vision and, ironically, experiencing a vision problem can create more stress. Stress affects your body in many ways, so blurry vision may be a secondary symptom. Sometimes stress causes your body to react as though its facing something dangerous and, as a result, your pupils dilate.