I wear glasses too, and I find that a standard cycling cap works well for me to keep most of the rain off. There will still be some, but it won't be as bad (unless the wind is blowing the rain directly in your face).

The caps are thin cotton, made to fit well under helmets and can be easily combined with earbands or full-coverage insulating head coverage.

On another note, I had a couple of pairs of blackbottoms shorts, and I didn't feel that they held up very well.