Hi there r many vision issues and we all have different ones...but pain while looking at different objects depending on the distance is one I can atest to....
But what I feel may be more of an issue is where u r, I always had issues in stores and it is from the florescent lights...I not only had pain, but would get sickened...very nauseated,...
My eye dr gave me transitions to help since they do have a tinted lens....I found they do help....even looking at the comp screen.
Do have a neuro optho look at ur eyes.....as that will be more in depth then a typical eye dr exam.