With how dark and cold the sun is, no one really thought to even check if snow blindness could be an issue in this new world. And because of the same reasons, symptoms appeared only after many years of living there

While yes, the sun indeed radiates very little UV, weaker ozone layer and same UV-reflectivity of ice as on Earth still makes it a real treat on a long timescale. It is esp common among crew that are regularly outdoors (very rare)
Moses, being long-range and space pilot, got a pretty bad case of it

also im trying my best to include CRT displays, in which case they also would contribute quite a big to Moses' case