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, me Thereof. 90 01 Optical fibres and optical fibre bundles; optical fibre cables other than those of heading 8544; sheets and plates of polarising material; lenses (including contact lenses), prisms, mirrors and other optical elements, of any material, unmounted, other than such elements of glass not optically worked Commodity Code Description 90 01 10 - Optical fibres, optical fibre bundles and cables 90 01 20 - Sheets and plates of polarising material 90 01 30 - Contact lenses 90 01 40 - Spectacle lenses of glass 90 01 50 - Spectacle lenses of other materials 90 01 90 - - - Colour filters for cameras