As part of my decision as to which iPad to get, I'd like to know if any of you happen to know if 60Hz refresh rate in displays is better on the eyes vs. 120Hz ones? I've found proponents on both sides, but only one can be correct. If a screen flashes at your eyes 60 times every second, as opposed to 120 items every single second, which is worse for your vision and overall health? The ProMotion feature of the newer iPad Pros was one of the features I specifically wanted to get, but given what we know about LED displays and blue light after dark, it has to play a role in the decision! Thanks!!