In answer to your one question, as someone who has significant eye damage, I can assure you that ereaders are much easier on the eyes than tablets when the back/front light is not used. That back/front light can be a bit harder on the eyes, but not as much as a tablet or phone. Reading with an ereader and a good reading light is preferable to using the back/front light. However, whatever the Voyage uses for a light, I have not had any problems whatsoever with that. It's better than either Paperwhite 2 or Paperwhite 3.
I do use a Fire to skim the news and to read magazines (although Asimov's magazine works fine on an ereader!). The 8" Fire is easier on my eyes than the cheaper 7" ones - although I don't know why.
I have never read the news with an eink device, so I can't answer that. I do find that I have to limit my time on screens other than an ereader. Dry eye, yeah, that's a big problem. It's a continuous problem for me made more complicated by the glaucoma drops I have to use. It helps to sit back with a warm/hot washcloth on your closed eyes for 5-10 minutes a couple of times a day.
All of the devices are adding that orange shading as an option. I'm not in the habit of using that mostly because I don't use a tablet more than an hour, but presumably, it will help with eye strain.
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