光學，照相，電影，計量，檢驗，精密，鐘錶和手錶，鐘錶和手錶，樂器及其零件及附件的儀器及器具, 90 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof, 90.18 -instruments and appliances used in medical, surgical, dental or veterinary sciences, including scintigraphic apparatus, other electro-medical apparatus and sight-testing instruments; parts and accessories thereof:, 90.18.50 -instruments and appliances used in medical, surgical, dental or veterinary sciences, including scintigraphic apparatus, other electro-medical apparatus and sight-testing instruments; parts and accessories thereof: --other ophthalmic instruments and appliances, 業務, 業務