Divorce is hard. Perhaps she's getting contacts as a way of boosting her mood, to feel better. Or as a metaphor for choosing to see things differently (through contacts).

I reacted to my T getting a different style of glasses a few years ago. It was like she wasn't the same person! Intellectually I knew she was, but it was unsettling to have her look different. I think that by modernizing her glasses, and appearance, she seemed more "now" and less my idealization of her.

It takes time to get used to change, and you will. But for now, here's hugs to you because it is hard an it is unsettling!