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1.56 Ngā arotahi whatu HMC hina porowhita-rua-arotahi
He pai ngā mōhiti arotahi-rua mō te hunga kaumātua, ā, ka taea te kite tata me te kite tawhiti. Ina kaumātuatia te tangata, ka heke te tirohanga, ā, ka tawhito haere ō rātou kanohi. Ā, ka taea e ngā mōhiti arotahi-rua te āwhina i te hunga kaumātua ki te kite i tawhiti, ki te kite tata hoki.
Ko te arotahi takirua e kiia ana ko te arotahi arotahi-rua, ko te nuinga o ēnei ko te arotahi papatahi, te arotahi porowhita me te arotahi kore e kitea.
Me whakauru ngā karāhe o ngā mōhiti tirohanga rua ki te diopter hyperopia, te diopter myopia, te downlight rānei. Te tawhiti o te pupillary tawhiti, te tawhiti tata o te pupillary.
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1.56 Ngā arotahi whatu HMC hina papatahi, papatahi, me te arotahi rua-arotahi
I runga i ngā tono o te ao hou, ko te mahi a ngā mōhiti whakarerekē tae ehara i te mea hei tiaki i ngā kanohi anake, engari he mahi toi anō hoki. Mā te takirua mōhiti whakarerekē tae kounga teitei, me ngā kākahu e tika ana, ka taea te whakakore i te āhua ahurei o te tangata. Ka taea e ngā mōhiti whakarerekē tae te whakarerekē i runga i te kaha o te hihi ultraviolet, ā, ka rerekē tōna tae. Ko te karāhe mārama kore tae taketake, ka pāngia e te hihi kaha o te mārama, ka huri hei karāhe tae, hei tiaki, nō reira he pai mō te whakamahi i roto, i waho hoki i te wā kotahi.
