Explanatory notes
… stereoscopic (three‑dimensional) pictures. Spectacles, pince‑nez, lorgnettes, monocles, etc., used for correcting … or of metal (wire gauze, or slotted plates). These articles include sunglasses, spectacles used for mountaineering or … electricians, roadmen, quarrymen, etc. The heading also includes goggles for underwater use; removable spectacles …