"Glass" is a pretty general term. I don't think that pure glass has
fluorescent properties, but there are thousands of varieties of manufactured
glass, containing a wide variety of additives and impurities, some of which
may fluoresce. In the case of camera lenses, I suspect any fluorescence may
be due to the multiple protective coatings applied to such lenses, rather
than to the glass itself. In any case, I have not noticed that this has
caused any problems in fluorescence photography. But theoretically it might
cause problems during very long exposures.
Paul M.