OPHTHALMIC MOUNTINGS AND PARTS THEREFOR ADAPTED TO SUPPORT AND HOLD LENSES BEFORE THE EYE; EYE PROTECTORS FOR PROTECTING THE EYE FROM GLARE, DUST, AND FLYING PRATICLES; OPHTALMIC LENSES AND BLANKS THEREFOR, MAGNIFYING LENSES, LENSES FOR TESTING THE ERRORS OF THE EYE, CONDENSING LENSES, SPHERICAL LENSES, CYLINDRICAL LENSES, TORIC LENSES, COMPOUND LENSES, INSTRUMENTS FOR MEASURING THE REFRACTIVE ERRORS OF THE EYE, INSTRUMENTS FOR MEASURING THE POWERS OF LENSES, INSTRUMENTS FOR OBSERVING THE REFRACTIVE CONDITIONS OF THE EYE, INSTRUMENTS FOR TESTING THE REFRACTIVE CONDITIONS OF THE EYE, INSTRUMENTS FOR TESTING THE REFRACTIVE CONDITIONS OF LENSES, MAGNIFIERS, INSTRUMENTS PROVIDED WITH LENSES FOR TESTING AND EXAMINING THE EYE AND OTHER OBJECTS, INSTRUMENTS FOR MEASURING THE PHYSICAL DIMENSIONS AND LOCATION OF THE EYE, INSTRUMENTS FOR MEASURING THE PHYSICAL DIMENSIONS OF LENSES, INSTRUMENTS FOR REFLECTING A BEAM OF LIGHT INTO THE EYE OR ON AN OBJECT BEING EXAMINED, AND PARTS FOR THE AFORESAID INSTRUMENTS