Their eyes will clear up after they've "gone blue" immediately before a shed, which is likely what you saw yesterday. Chances are that you just missed him being "in blue" in the days prior. It's perfectly normal and honestly pretty easy to do when they're younger - the whole shedding process is pretty quick with the little guys.
Here's a link (which I believe is also in my signature) that I've found incredibly useful: The Shedding Process