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3D3DDidymium glasses.
This is a lens from a pair of didymium eye glasses meant for glassblowers. The "di" refers to "two", the "dymium" refers to the two elements in the glass, which both end in "dymium". Those two are praseodymium and neodymium. Together they cause the glass to strongly absorb the sodium yellow emission line that creates the bring glow when glass is molten. Wearing them you can stare directly into the molten glass and see only a dull glow from the torch.
Source: eBay
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 25 March, 2009
Price: $50
Size: 2"
Composition: PrNd