… spectacles, curved, bent, hollowed or the like, not optically worked; hollow glass spheres and their segments, …
Explanatory notes
… spectacles, curved, bent, hollowed or the like, not optically worked; hollow glass spheres and their segments, … other words the heading covers a range of glasses of types normally designed to protect the dials or faces of the … sun-glasses and other protective spectacles), i.e., glass generally of poorer quality than used for corrective …