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But again ...lumen for lumen, your eye does not know the difference between photons that were reflected vs photons that weren't. Which only further strengthens the intensity argument. It's not what happens to the photons before they get to your eyes. It's the intensity of the light when it DOES get there.
Light shined into someone's eyes at the same intensity as light that is being reflected into someone's eyes should generate the same level of eyestrain in an individual (ignoring pixel density of the screen technology for the moment).
Hence most claims of eyestrain from backlit screens HAVE to be because of intensity differences. Whether that is because people don't dim their LCD screens enough when reading, or LCD screens cannot be dimmed enough is a different story.
All I can say is that the brightness on my tablet (which is only ever utilized indoors), is nearly all the way off at all times. I use it exclusively for reading (be it books, websites, email or social media).
I have no trouble believing that many phones/tablets don't provide a way to dim the screen enough for comfortable extended reading periods. But I just don't buy the inherent superiority of reflected vs direct light with regard to eyestrain. At the same intensities, there can be no difference. Therefore: finding the right intensity (given equal pixel-density) is the whole of the issue.
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