Back in the mid-90s, my boss had cataract surgery on one eye, which gave him 20/20 vision in that eye. After that his glasses had one Rx lens (for the non-corrected eye) and one plain lens (for the post-cataract eye).

I imagine the doctor will have a solution like that for your friend, since I'm sure they deal with it all the time.

I have a friend who is having cataract surgery soon. She had lasik some years ago, but still wears glasses for reading. I will have to ask her if she will be able to lose the reading glasses after the surgery.