[Janel]

Thanks for the info. The binocular loupes were used by my uncle David when he practiced dentistry in the 1950's. After some years, I acquired them and find them to be indispensable. Used together with a special pair of carving lenses, they provide between 8.5 to 10 x magnification. Perfect. My carving glasses are seamless bifocals with a stronger prescription aimed at focusing about 10-12" from my face for carving, the upper area is best at about arm's length, for tools and bench top sightings. I can look over or under the loupes with the carving glasses, sort of like the loupes are a trifocal, but smack dab in the middle of the glasses. I do not know if they are replaceable.