Photochromic lo ntsiab muag tsis yog tsuas yog qhov pom tseeb xwb, tab sis kuj tiv thaiv feem ntau ntawm kev puas tsuaj rau lub qhov muag los ntawm UV rays. Ntau yam kab mob ntawm qhov muag, xws li hnub nyoog ntsig txog macular degeneration, pterygium, senile cataract thiab lwm yam kab mob ntawm lub qhov muag yog ncaj qha cuam tshuam rau ultraviolet hluav taws xob, yog li photochromic lo ntsiab muag tuaj yeem tiv thaiv lub qhov muag rau qee yam.
Photochromic lo ntsiab muag tuaj yeem kho lub teeb xa mus los ntawm kev hloov pauv ntawm lub lens, kom tib neeg lub qhov muag tuaj yeem hloov kho lub teeb pom kev zoo, txo qhov pom kev qaug zog thiab tiv thaiv ob lub qhov muag.