It is normally because of 'dryness' you can do the following to reduce the level of eye-stress-
-if you are using a desk top then change the screen to led.
-Use an anti-glare eyeglass when you use computer.
-20-20-20 ie, after every 20 minutes,20 seconds look to a distant place then close your eyes 20 seconds, this will works alot.
at airport road, near kebab king there is a good doctor..