I've been trying the Blue Light Filter by Hardy Infinity lately. It really seems to help with my night-time (total darkness) reading. But I've only been using it for a few days now.
I don't get headaches or eyestrain, but when I wake up earlier than the sun and grab the tablet to try and get a few pages in, even the lowest brightness setting can be an uncomfortable shock until my eyes adjust. The filter eliminates that shock and makes things easy-peasy. But it does seem to make the text a bit more blurry the higher the opacity is set on the filter.
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