I sat in on a few courses by Pat Tolar this week-end. At one point mentioned that you could see X number of feet in water with gray(grey for those of you what went to school up Nawth) polarized lenses and X+ feet in the water with Brown Polarized lenses. Pat went on to say that every good optician knows this. I don't if someone out there do, please enlighten me.

Thanks,
Chip