Snakes go through a cycle prior to shedding. They start off at their lightest and brightest right after the shed. Then the colors fade a little and they go to there normal coloration. A bit before sheding you will notice darkening, muddying, and dryness of the skin. After this they go into "blue, where the belly, and eyes become opaque. After a few days in blue, the colors fade and the snake will appear almost normal. A day or two later the shed will occur and the cycle starts over.
The eyes becoming uncloaded is not sheding of the eye caps, just the milkyness going away.