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1.56 Ruwan tabarau na gani mai launin toka na Bifocal Photo Semi Finished
Gabaɗaya, gilashin myopia masu canza launi ba wai kawai suna kawo sauƙi da kyau ba, har ma suna iya tsayayya da hasken ultraviolet da haske yadda ya kamata, suna iya kare idanu, dalilin canza launi shine lokacin da aka yi ruwan tabarau, ana haɗa shi da abubuwa masu saurin haske, kamar azurfa chloride, azurfa halide (wanda aka sani da azurfa halide gaba ɗaya), da ƙaramin adadin jan ƙarfe oxide catalyst. Duk lokacin da hasken azurfa ya haskaka ta hanyar haske mai ƙarfi, hasken zai ruɓe kuma ya zama ƙwayoyin azurfa baƙi da yawa waɗanda aka rarraba a cikin ruwan tabarau. Saboda haka, ruwan tabarau zai bayyana duhu kuma ya toshe hanyar haske. A wannan lokacin, ruwan tabarau zai yi launi, wanda zai iya hana hasken cimma manufar kare idanu.
