Optical fibres and optical fibre bundles; optical fibre cables not of heading no. 8544; sheets, plates of polarising material; lenses, prisms, mirrors, of any material; unmounted; not non optical glass

Optical fibres, optical fibre bundles and cables; excluding those of heading no. 8544

Optical elements; polarising material, sheets and plates thereof

Lenses, contact; unmounted, of any material, excluding elements of glass not optically worked

Lenses, spectacle; unmounted, of glass, excluding elements of glass not optically worked

Lenses, spectacle; unmounted, of materials other than glass

Optical elements; lenses n.e.c. in heading no. 9001, prisms, mirrors and other optical elements, unmounted, of any material (excluding elements of glass not optically worked)