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1.56 Ngā arotahi whatu kikorangi kua oti te tapahi ā-rua
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.
