You can install the myopic inner frame in the picture in the snow mirror. I don’t know if it’s the butterfly mirror you mentioned, but I don’t recommend it. Skiing is a strenuous exercise. It can even cause damage to your eyes. It is hard to find if it falls in the snow. It is inconvenient to deal with after fogging. You also have to put a pair of glasses on your body for use when you are not wearing snow glasses, so I still recommend you to wear contact lenses.