the goggles do nothing

This year's CONvergence is allegedly more steampunk themed than usual, so we may be required to wear goggles to the various sessions on evolution, skepticism, etc. I need help picking out which ones to wear. So far, these are the choices: Hobart Welding Goggles: Harry Potter Quidditch Goggles: Flip Fronts: Classic Round Lens Moto Goggles: