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What can make the white part disappear from an aquarium fish's eyes?

I got an aquarium fish a couple weeks ago and noticed when I got it home that it had no white in either of its eyes. They were both completely black (and appeared to be all round pupil, with no white part or other type of ring/distinction between iris and pupil). Tonight I noticed that the fish's eyes look normal again, like the other fish in the tank. I'm just wondering if anyone knows what this is and/or what could have caused the change.

Public Comments

1. It's not that big of a deal it's just the way it is. It's just like you being in a room that's dark then stepping out into the sunlight, your eyes will adjust.