It causes dry eye and eye strain issue. while working on computer, every 20 minutes, take a 20 second break and look at a distant object 20 feet away. Keep yourself hydrated. Blink more often. Stay away from ac and fan. You can use plano antireflective/ blue lens glasses while using computer. Eye drop teardrops 4 times a day for 1 month will help you for the dryness.