Contacts with wrap around sunglasses such as Smith Sliders with interchangeable lenses or Specialized with the photochromatic lenses. My vision is so poor that I am unable to ride in glasses because I have absolutely no peripheral vision.

I wear Ciba Vision Focus Night and Day 30-day extended wear disposables. Love em. Incredibly comfortable and don't even notice they're there.

Glasses are a must even for people who don't need their vision corrected. There is too much stuff flying around in the area at high speeds that can do damage, not to mention the constant drying effect on the cornea. Sunlight exposure is also tied to cataracts.