Lokacin auna ultra-thin gilashi, da yau da kullun lamba irin kamar masu nuna manufa, dubu mita ma'auni ba ya gamsar da ma'auni, sauki lalata kayayyakin. 20-30 micron gilashi ta hanyar ma'aunin tuntuɓar wucin gadi ba shi da gaskiya. Za a iya amfani da ma'auni na gani mara tuntuɓi kawai, wanda zai iya rage raunin biyu na kayan aiki ga samfurin. Yanzu kasuwar da aka yi amfani da mafi yawa shi ne spectral confocal fasahar auna kauri na ƙananan gilashi, da al'ada spectral confocal fasahar auna transparent abubuwa bukatar hango da kayan refractive factor, don a zahiri auna kauri, kuma a cikin ma'auni da kauri daban-daban na wannan kayan, refractive factor ne m, a cikin m yana da wani refractive factor zai shafi ma'auni darajar.

THIJNKFOCUS musamman fasaha, a ma'auni m gilashi kauri zai iya kai tsaye ma'auni kauri ba tare da refractive coefficient.