My wife does this every year. She has amazingly poor eyesight, just within the range of correctability. She removes her glasses to look at the tree. She says while she cannot see the ornaments, the lights blossom into little globes of magical fire, suns and stars, as if she were looking at "God's Christmas tree."

If I squint in a certain way and blink at the correct moments, I can almost see them too. I'll keep my OK eyesight and my fanciful wife to see those magic things for me.