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The only eyepiece manufacturer I have ever come across that gave a name to the glass they used in their eyepieces was Vixen with their LV series which uses Lanthanum glass which itself is a low-dispersion. But being a Vixen fan Lewis you would have already known this bit.
Takahashi uses ED Extra-low-dispersion glass in their LE & UW series which is also used in the TMB, Televue and Saxon brands. Now FLP-53 is considered an Extra-low-dispersion glass so by association FLP-53 could be used to manufacture one or more elements in these multi element designed eyepieces. Cheaper eyepieces just use flint and crown glass.
I have not come across any manufacturer that manufactures fluorite eyepieces possible due to cost and difficulty working with the material particularly since is is a fragile material.
I do have a Baader Flat Field Converter (FFC) that has elements manufactured from fluorite and that was a very expensive item to buy.
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