I take zoloft. And yes, it has improved my perception. Initially, for the first couple months, things seemed worse, but I stuck with it and now things have cleared. Seems better for DP/DR type things than directly hppd. BUt, I obsess a lot less about hppd now, which is the prime reason I take it.
The thing to is, there's the visual distortions themselves, and then there is the worry or obsession about them. If you spend too much time worrying about them, you're body probably wont heal since you'd just be stimulating the same pathways over and over by focusing on them, and stressing.
So, I really find it just as important, probably actually more important these days to try to reduce my obsessions about my perception, and in turn, things have slowly gotten better....