It's based on the European council's guideline 90/270/EWG. As far as I can tell, it's up to the countries to implement corresponding laws, and at least Germany and Austria have such laws.
Ah, OK. Interestingly, I just checked the UK regulations for this and they define the positioning of the light sources, not the qualities of the screen:
Possible disturbing glare and reflections on the screen or other equipment shall be prevented by co-ordinating workplace and workstation layout with the positioning and technical characteristics of the artificial light sources.
Possible disturbing glare and reflections on the screen or other equipment shall be prevented by co-ordinating workplace and workstation layout with the positioning and technical characteristics of the artificial light sources.