I interpreted the white eyes as Palps having gone blind because that’s how badly his body’s deteriorated.
Agreed, basically its from his decaying body … it seemed very clear to me that’s what was going on that’s what they were going for … which made some sense.
But why the milky Eye’s for Rey in that vision … made no sense. Sith eyes would have made both sense in the context of the vision AND actually connects to the previous movie’s portrayal of Sith Eyes.