$200 CAD just to be seen?! And I thought $65 USD was a lot...

Do you happen to have an image of the eye in question? It may help.

While looking up ways to treat frogs, I happened upon this old thread on Caudata.org mentioning using contact solution to treat skin injuries since, at its core, contact solution is effectively just a saline solution. I imagine a saline solution could be dripped into the eye, though I admittedly do not know what a safe percentage would be for a frog. Digging on my end proved a bit fruitless, but I wanted to pass this info onto you in case you want to try it. I have personally given one of my whites tree frogs dips into very strong saline solutions, including running it over her head and eyes, and it has not harmed her (though at the strength I was using, they were brief and required multiple rinses). I know RETFs are more delicate, so YMMV, but like I said, just wanted to pass this on to you as an option if it's something you want to try.