Re Smith OTG gogglesEvan, I just recently looked at both of these goggles. The Knowledge in specifically designed to fit over glasses, but it is a very large goggle. The Prodigy is slightly smaller("fits medium faces") and it may fit over your glasses- it just squeezes over mine. Another option is the turbo fan version of either goggle. Those versions are supposedly the most fog free goggles on the market and they would allow you to use Smiths snap in optical inserts instead of your glasses. The only drawback is the increased cost compared to the other versions. I just ordered the Prodigy Turbo for myself last week. If it works as advertised, it will be well worth the price. Good luck.