Im using an old mid 2010 iMac and my eyes become dry and hurt when im working over 5-6hrs. I was wondering, is it the old display and the lighting conditions that create this dryness? Would i be better off if i was using an iMac with a Retina display? Or should i just get a different kind of computer where i can select a different display altogether? Perhaps an oled display, if there is such an option that is ;-)