For a computer screen on a desk, you are often much further away from the text you’re reading than you would be if you read it from a printed page. People hold smartphones and pads at various distances, from a few feet to a few inches from their eyes. Neither extreme is ideal for reading, and watching videos at the wrong distance can strain your eyes, too.
Symptoms of digital eye strain include blurry vision, eye pain, headaches, dry or irritated eyes, double vision, neck pain, and fatigue, or even dizziness. Some conditions like poor lighting and extreme air movement can make symptoms worse. Bright overhead lights or strong blue-spectrum backlights can worsen computer vision syndrome, as can air currents from vents or fans. Even if you don't think you see air currents, your eyes react and constantly adjust when air moves in front of brightly lighted screens.