The final lens-related consideration is how easily interchanged the lenses are. Some goggles have very easily-changed lenses. These are ideal if you will be spending a lot of time on the slopes and will see various weather and light conditions and need to adjust from low-light to high-light lenses. Other frames are harder to change out, and will have to be changed out at the lodge. Some lenses are set into the frames and cannot be changed. In these cases, you will have to have separate goggles for different light conditions.