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Using my Samsung Note cell phone I took a video of my Kobo Forma screen, and my Kindle Oasis 2 screen. The vertical bars referred to in this post were evident in the video of the Kobo Forma. The Kindle Oasis 2 video has no evident vertical bars. The illumination on both was set at 20 percent for Kindle Oasis 2, and 30-30 (light-natural) for the Kobo Forma.
Having said that, I have yet to notice any obvious eye strain. Nonetheless, pwm would seem to disqualify the Kobo Forma screen as a paper equivalent, at least to sensitive individuals.
I intend a cross-over experiment with two successive days of boring reading (interesting reading results in too many eye-movements and may therefore induce strain independently) with both devices to see whether it matters to me.
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