you should never ever ever touch the inside lens of any goggle. outer lens - fine, fog it with your breath and wipe it with your tshirt... inner lens filled with snow? tap it out and put em back on and let your body heat push it out. never touch the inside.
smith I/Os are good goggles. i would say that 30 second changeable lenses and 40-50$ replacement lenses is kinda the requirement for me now.