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First, I know from personal experience that tablets are harder on the eyes than eink readers. When you have significant eye damage, you see the problem really fast.
There are ways to improve your eyesight that work. I used techniques from a paperbackbook called Do You Really Need Eyeglasses by Dr. Marilyn B Rosanes-Berrett. I eliminated my astigmatism and was able to go back to regular single vision lenses for a couple of years. My sister was able to significantly reduce her prescription while my other sister improved her vision enough over 6 months that she still hasn't needed to get bifocals (she's over 50 now, so time will tell). However, just like losing weight, it's something you have to do for a while every day always for it to work. It's not a miracle worker though - will not fix retinal damage or glaucoma, for instance, which is why I stopped the exercises.
The most basic exercise is to put your hands over your eyes and leave them there for as much as you can (I did this for an hour a day). The warmth from your hands affects the temperature of your eyes. I suppose it relaxes them or something which improves operation over time. My ophthalmologist was impressed how well it worked for astigmatism.
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