Hey Yellow, what sort of contacts do you use?? Are they disposable? Lenses you generally sleep in at night?
Mine are disposable, one month lenses, and I sleep in them every night. Maybe one night total per month I will take them out - but most of the time I do not remove them EVER (don't tell my eye doc would not be happy.)
Anyway, I seem to recall having an issue like that come up on some ride - where everything got sort of white-ish and I really couldn't see. For the life of me, I can't remember what ride that was (I don't think it was a double or the 600k). I generally dispose of my lenses after a double or super long ride because it does seem to take something extra out of them. I generally wear my one month lenses for 5 - 6 week (don't tell), but then after a double or whatever, they may not last a month.