The ones with the specs are very interesting. It could be nothing to do with it but I remember seeing some bone 'specs' in the British museum or somewhere - but really they were so people didn't get snowblind, they had a thin slot to peer out of. Is it conceivable the ones on your statues could be sunglasses too, maybe for when you're rowing out on the sea?
Hi RhiannonThe snow specs that you saw may have been similar to the one shown on this figurine - http://static.newworldencyclopedia.org/thumb/a/ae/JomonStatue.JPG/424px-JomonStatue.JPG These clay figurines are from the early Japanese Jomon Period (approx 11,000-300 bce). There are both Polynesian and Mongolian elements in the ethnic makeup of the Japanese so both a sunglass or a snowglass theory are possible.