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, PHOTOGRAGHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 18 APPARATUS AND SIGHT-TESTING INSTRUMENTS. 90 18 50 OTHER OPHTHALMIC INSTRUMENTS AND APPLIANCES 90 18 50 00 OTHER OPHTHALMIC INSTRUMENTS AND APPLIANCES Commodity Code Description 90 18 50 00 000 OTHER OPHTHALMIC INSTRUMENTS AND APPLIANCES