Yeah so maybe the first flash of Rey on the throne she could have normal eyes, but then replace her milky eyes in the second flash with Sith eyes. That would ease into it as well.
Wait … it’s been too long since I’ve seen it, she has milky eyes in the vision? LOL. What the heck? That is lame. Milky white eyes doesn’t even begin to associate with Sith.
I think JJ forgot what he did with Palps (being some decaying clone/thingy) and what Sith eyes are. If he took a moment and rent the previous star wars movies … 😛