[ Toph's about to say that sounds pretty neat, but then she clarifies that she's having trouble with it, so she frowns instead. She's had her method of 'seeing' messed with enough for her entire lifetime; it makes her sympathetic. ]

That sucks. Is that something that happened here? [ Or before she got here?

Anyway, a trade is a trade, so Toph adds, ] I see by feeling things through the earth. Being out here on a boat means the whole ocean's a big ol' blank.