The drug in question is perfluorohexyloctane, which is part of a class of substances known as PFAS or „forever chemical“. I‘m a chemist, I love modern medicine and material technologies based on chemistry, and I don’t hesitate to take vaccines or other meds, and I also happen to have SEVERE dry eyes syndrome - but hell no, I’m not going to put that stuff into nature!

The volumes in question are milliliters per month. And perfluorohexyloctane has been used in much larger quantities for intraocular fluid replacement for about 3 decades without negative side effects.

The whole PFAS scare is waaaaay too overblown.

Precisely. Just because a medicine is an approved medicine increasingly shouldn't automatically mean that any sensible patient should ever use it. The PFAS in question is not even short chain, it is medium chain, which means it's likely to accumulate inside the body, albeit at a slow pace. One doesn't even have to be a chemist to know these things.