Developing cataracts will alter what color you see, too. I had chosen a border for a quilt before my surgery only to discover it was totally wrong when I got back to putting it all together. When I explained my purchase to the gal cutting my new choice, she commented that I was lucky it was only the border. Her grandmother had made an entire quilt thinking red was pink (or maybe vice versa) and had to deconstruct the entire thing after her surgery. I was seeing blues different--the royal blue of the Cowboys was periwinkle! My eye dr says to compare the works of Monet and see how his color palette changed with time, believed to have been because of cataracts.