I had cataract surgery and it was terrific and painless and miraculous. I wrote about it, of course. Although it's rude to drop links to your own work into the response section of another writer's post, I'm going to link to the piece here so you can pass it along to your sister. I've been told that it has helped more than one reader with their cataract-surgery-related anxiety.

https://rosalindwarren.medium.com/what-is-cataract-surgery-actually-like-1eef61691072?sk=6bbbdc696e470956bf90ad26f8b9b0fd