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OPHTHALMIC LENSES AND FRAMES, PROTECTIVE GLASSES AND LENSES THEREFOR, CONTACT LENSES; MATERIALS AND DEVICES USED BY OPTOMETRISTS AND OPHTHALMOLOGISTS FOR THE EXAMINATION AND CORRECTION OF VISION-NAMELY, FOCOMETERS, PUPILMETERS AND KERATOMETERS, TOPOGRAPHIC INSTRUMENTS-NAMELY, SKIASCOPES, READING SCALES, RANGE AND DISTANCE FINDERS, TACHOMETERS, THEODOLITES, LEVELS, SURVEYOR POLES AND SEXTANTS, BAROMETERS, THERMOMETERS, COMPASSES AND MAGNIFYING GLASSES