What you’ve mentioned is part of it, but we’ve done comparisons in bright sunlight through a magnified optic with similar results. She just does t resolve the detail that I do. Like the comment under yours though, she can differentiate more colours than I can.

Even with glasses some peoples vision is terrible. My wife kept complaining she couldn’t see the things I would point out. I took her out to the beach in the middle of nowhere and pointed out Cassiopeia and drew the main stars in the sand and had her fill in the stars around it by descending brightness. That was the day I learned that even with corrected vision, some peoples eyes just aren’t that good.