You should have splashes of cold
water at least 3-4 times a day which will help in wiping off the dust and provide some moisture also to the eye. Along with lubricating eye drops (which you are already using) you should use some anti-inflammatory eye drops. You should try to blink while working on computers when your eyes start getting tired.
Also, you should get a refraction
(vision test) done for correction of refractive error
Hope this helps.
Dr AK Garg