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1.59 PC Bifocal Invisible Photochromic Grey HMC Optical arotahi
I tēnei wā, e rua ngā momo rauemi arotahi kei te mākete, ko tētahi he rauemi karāhe, ko tētahi he rauemi kapia. Kua wehea ngā rauemi kapia ki te CR-39 me te polycarbonate (rauemi PC).
Ko ngā karāhe arotahi-rua, ko ngā karāhe arotahi-rua rānei, he karāhe kei roto ngā wāhi whakatikatika e rua i te wā kotahi, ā, ko te nuinga o te wā e whakamahia ana hei whakatika i te presbyopia. Ko te wāhi tawhiti i whakatikatikaina e te karāhe arotahi-rua ka kiia ko te wāhi tawhiti, ā, ko te wāhi tata ka kiia ko te wāhi tata me te wāhi pānui. I te nuinga o te wā, he nui te rohe tawhiti, nō reira ka kiia hoki ko te kiriata matua, ā, he iti te rohe tata, nō reira ka kiia ko te kiriata-iti.
