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Iilensi ze-optical ezingwevu ze-Bifocal ezi-1.56 ezigqityiweyo
Ngokubanzi, iiglasi ze-myopia ezitshintsha umbala azinakuzisela nje kuphela ukulula kunye nobuhle kodwa zinokumelana ngempumelelo ne-ultraviolet kunye ne-glare, zinokukhusela amehlo, isizathu sokutshintsha kombala kukuba xa ilensi yenziwe, ixutywa nezinto ezibuthathaka ekukhanyeni, ezifana ne-silver chloride, i-silver halide (eyaziwa ngokuba yi-silver halide), kunye nenani elincinci le-copper oxide catalyst. Nanini na xa i-silver halide ikhanyiswa kukukhanya okunamandla, ukukhanya kuya kubola kwaye kube ngamasuntswana amaninzi esilivere amnyama asasazwa ngokulinganayo kwilensi. Ke ngoko, ilensi iya kubonakala ifiphele kwaye ivale indlela yokukhanya. Ngeli xesha, ilensi iya kuba nombala, nto leyo enokuthintela ukukhanya ukufezekisa injongo yokukhusela amehlo.
