Hi
Correct prescription of glasses plays important role in reducing the eye strain.As you have already mentioned that after changing specs the strain is reduced,that means it was primarily due to incorrect sight correction.Now you can use tear substitutes for further improvement and Do near and far exercises to avoid further strain,means every 5 minutes of your near focus you have to look far for atleast 2-3 seconds.This will reduce amount of strain on your eyes while looking near.After your work just do apply ice or Kheera on your closed eyes to reduce work stress.
Next Steps
Confirm whether your glasses are of correct sight correction
Health Tips
Follow tips which you are already doing