The article deals with summarization of existing research of medieval glass in Bohemia. It outlines a general trend within which particular research phases can be separated depending on the research intensity and items. Here is a brief specification of initial phases and detailed characterization after the year 2000. Information on recent surface prospection activities run by Ústav archeologické památkové péče (the Institute of Archaeological Monuments Care) at the central part of Krušné hory Mts. in north-western Bohemia that are focused on newly afforested areas of mountain ridges. We can find a description of surface prospection that had led to localization of three extinct medieval glassworks around the Brandov village (distr. of Most) and evaluation of recent results and defining of their contribution to the knowledge on glass production history in the Top Middle Ages.