Whānuitanga tono matua o te mata wiri raina:
Ko te mata wiri raina e whakamahia whānuitia ana i roto i ngā kirihou, ngā mea whakakoi, ngā matū, ngā rongoā, ngā rauemi hanga, te witi, te tongi waro me ētahi atu ahumahi mō te tirotiro me te whakarōpūtanga o ngā rauemi kirikiri me te paura.
Ko te mātāpono mahi o te mata wiri raina: ka huri ngā motuka e rua i runga i te mata wiri raina i ngā taha rerekē i te wā kotahi, ka meinga te whakaoho kia whakaputa i te kaha whakaoho whakamuri, ka akiaki i te tinana mata kia peia te mata kia neke roa, ā, ka nekehia ngā rauemi i runga i ia wā. Makahia he whānuitanga i mua i te whakaoti i te mahi tirotiro rauemi.
Ka peia te mata wiri raina e te motuka wiri rua. Ina tukutahitia ngā motuka wiri e rua, ka hurihia hoki ki te taha whakamuri, ka whakakorea ngā kaha whakaoho e puta mai ana i ā rāua poraka rerekē i te ahunga whakarara ki te tuaka o te motuka, ā, ka whakatakotoria ki te ahunga poutū ki te tuaka o te motuka, nō reira he rārangi tika te ara nekehanga o te mata. He koki piko te taha o ngā toki motuka e rua ki te mata o te mata. I raro i te kaha whakakotahi o te kaha whakaoho me te kaha taumaha o te rauemi, ka whiua te rauemi ki runga i te mata o te mata kia neke whakamua ai te raina, kia tutuki ai te kaupapa o te tirotiro me te whakarōpūtanga o te rauemi. He pai mō te tirotiro i ngā rauemi paura maroke me te rahi matūriki o te 0.074-5mm, he iti iho i te 70% te ihirangi makuku, ā, kāore he piri. Kāore te rahi whāngai mōrahi e neke atu i te 10mm.
Ngā āhuatanga matua o te mata wiri raina: He tino tika te tirotiro o tēnei hua, he nui te kaha tukatuka, he māmā te hanganga, he iti te whakapaunga pūngao, he iti te haruru, he roa te ora o te mata, he pai te mahi hiri, he iti te turuturu puehu, he watea te tiaki, ā, ka taea te whakamahi i roto i te hanga raina huihuinga. Ngā mahi aunoa.