I recall studies showing that reading in poor lighting conditions is a cause of myopia in children. So I'm questioning whether we want to be reducing luminance on our devices at all.
I like my (warm-coloured) lights and screens set to max brightness. I find it's easier to read and lets me work with more distance from the screen.
But what about easier sleep? Could we exercise more? Leave screens out of the bedroom? I have no idea.
Significant outdoor exposure is essentially the only relevant factor for preventing myopia. I would be interested in seeing any studies that showed any meaningful relevance of low light reading, while controlling for time spent outdoors.