Is it just one eye, or both?
I have kept them for years, and I have noticed this before, but the ones that had white eyes were like that when I got them.
May I ask, how did you treat your White spot?
I just posted a thread asking this exact question. I just realised that all I have in the cupboard for Ick is Malachite Green, and now I can't use it due to copper, and I hate the stuff anyway because it dyes the wood green, and I can't really take it out because my tank would become a war zone.