Furthermore, the glasses must not deteriorate or lose their properties as a result of the effects of radiation emitted under the foreseeable conditions of use and all marketed specimens must bear the protection-factor number corresponding to the spectral distribution curve of their transmission factor.
Thairis sin, ní fhéadfaidh na spéaclaí dul i léig ná a n-airíonna a chailleadh mar thoradh ar éifeachtaí radaíochta a astaítear faoi dhálaí úsáide intuartha agus caithfear uimhir an fhachtóra chosanta, a bhaineann leis an gcuar dáileacháin speictrigh dá bhfachtóir tras-seolta, a chur ar gach leagan ar an margadh.