Ok - I didn't even realize this thread was about eyewear - the title was kind of mis-leading.
When you are working soft glass frit, you've got nothing to worry about for your needs of additional eyewear filtration. The AUR-99 furnace worker filter is designed for the furnace workers who are looking into a 2100 degree furnace gathering glass, or the 2400 degree glory hole reheating glass. You don't need this filter in addition to your AUR-92's "just because you are working with furnace glass frit".
The issue here is one of scale. With a torch and a bead and some frit, you have a very small heat source - under 2-3 square inches. There is very little heat getting that 14-16 inches to your eyes.
We discontinued the visor because we introduced the table shield. A lot of people found that the visor was impeding their vision, reducing their peripheral vision. Once the table shield came out, our visor sales dropped dramatically, so it made sense to have just one non-spectacle type filter device.
What type of additional filter did your specialist want to see? The only "step up" that I could recommend would be the AGW-186 filter. This is the same base filter as the AUR-92 but with an added infra-red filter to remove the heat energy. This is a filter that was designed for scientific glassworkers, who work mainly clear borosilicate glass. It has very good visible light transmission, only slightly (about 10%) less than the standard AUR-92 filter. It is available in non-prescription and single vision prescription.
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Chaotic Glass: Safety for the glassworker, and random thoughts and opinions on the state of the glassworking world
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