simplex
Around 6 years ago I stopped eating red meat and dairy to treat inflammatory bowel disease. I had an immediate improvement, and have continued to heal a noticeable amount year on year. To my surprise, 2 years in I noticed the migraines I got from screens had reduced in intensity a lot, and continued to do so, now many devices which used to cause migraines are now fine, and others reduce in intensity each time I use them. From what I have read, autoimmune disease's lower serotonin, and that lower serotonin levels increase the risk of migraines. By finding and treating the cause of my autoimmune disease, I have raised my serotonin and thus also improved my screen induced migraines.
The devices which still cause me problems are all IPS LCD displays, I do not know what separates them visually from other screens.