The whole eye strain deal is more complicated than what I have talked about in past here.
I think there are personal and external factors which make one more strongly susceptible to the computer display eye strain. Important such factors I believe are: slower ability to accommodate/focus (needs constant practise preferably before it becomes slow), indoor air quality, lack or excess of some things in the body that the eye uses.
However, those who are suscept, report that different display technologies have large effect on the strain. eg. If you configured the room and the lcd, crt, oled & eink displays in the room to display text as similarly as you could, I suspect that the suscept persons still would find the eink and a regular book least eye straining, assuming ambient light was say scattered/indirect cloudy day light.