We started to research the eye drops, the metacam, and the eye dye he was given again this time. It turns out that in the US, the FDA does not approve the repeated use of metacam in cats. Oral suspension has not been shown to be safe under any circumstances, and the injection is only to ever be given once before operations. The drug has been shown to cause renal failure and death in cats.
Several things come to mind. It's strange what you say about meloxicam, because it would usually cause a different type of side effects. Have you asked the vet about it?
Low doses of meloxicam can be safely used in cats for longer times. But my personal choice is Onsior (robenacoxib). Based on the research, it has the least side effects in cats. But unfortunately there are no NSAIDs with zero side effects, so do your reaearch anyway.
Also perhaps worth asking if they used atropine drops, since atropine causes mydriasis and could be part of uveitis treatment. This would explain the dilated pupils.
And I would also ask if they ever measured your kittie's blood pressure. Because unfortunately chronic high blood pressure can lead to progressing blindness. And one of the symptoms is mydriasis (and/or uveitis).
Also, here's a comprehensive information about uveitis. Unless you already found this page:Managing Uveitis in Dogs and Cats