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1.56 Ngā arotahi whatu HMC hina-whakairoiro tapatoru kikorangi
He rauemi mārama te karāhe arotahi, kotahi, neke atu rānei ngā mata piko i hangaia ki ngā rauemi whatu pērā i te karāhe, i te kapia rānei. I muri i te whakakanapa, ka huihuia hei karāhe me te anga karāhe hei whakatika i te tirohanga a te kaiwhakamahi, kia mārama ai te tirohanga.
Ko te matotoru o te karu arotahi e whakawhirinaki ana ki te taupū whakaata me te nui o te karu arotahi. He angiangi te pokapū o ngā karu arotahi myopic, he matotoru hoki ngā taha, engari ko ngā karu arotahi hyperopic te ritenga kē. Ko te tikanga, ko te teitei ake o te tohu, ko te matotoru ake o te karu arotahi; ko te teitei ake o te taupū whakaata, ko te angiangi ake o te karu arotahi.
