I don't know why no one has replied to your question so far. I think
the use of urine as an eyewash has been discussed here before. I haven't
yet tried it myself but I want to, because I think it might help improve my
vision. Of course, it would probably help if I spent less time online!
Yes, it would be fine to use your partner's urine in an eyecup. Nice that you
can be open with your partner about this. It's not that common!
IMO going off the medication would be best, but use your judgment.