One of the main reasons for sore eyes when working for long periods on a computer screen is lack of blinking. In normal looking around throughout the day, the eyes blink an enormous number of times and this acts a wiper removing dust and other particular deposits.
When concentrating on a screen in what is a fixed stare, the eyes hardly blink at all in comparison resulting in a lack of wiping. The thing to do is sit back every 10 or 15 minutes and do eye blinking exercises to introduce sufficient wiping to stop the eyes from getting this problem.
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