Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 90 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof 90 01 Optical fibres and cables; polarising material; lenses, etc, unmounted.... 90 01 50 Spectacle lenses of other materials 90 01 50 00 Spectacle lenses of other materials Commodity Code Description 90 01 50 00 000 Spectacle lenses of other materials