Nā ngā kēhi holoāhanga tūturu e whakapakari ana i te hangarau haumaru matua, i raro i tēnei ka tuhi hei whakahoki i ngā mahi whakamahitahi me ngā tuhinga kōrero. Ko ēnei etita matatini e whakauru ana i ētahi atu whakaaetanga haumaru, he mea nui ngā take māngai o te miro, ngā pātengi kupu itiiti, me ngā huataki whakapā mai e mahi ana hei whakakore i te hunga taea. Ka whakamahi ngā kēhi ki ngā taonga fotonika matua e hanga ai i ngā uara toru-tauwhiro, e takahi ana i ngā tae me ngā pātengi i roto i ngā pūnaha katoa. Ki ia kēhi holoāhanga tūturu, ko ngā kōnae tuakiri me ngā nūmbera rerenga e taea ana te whakamātau i raro i ngā rīpoata whakamahere ara rongoā rānei, me ngā tono ā-ringaringa. Ko te hanganga mō ēnei kēhi kei te hanga i raro i te tikanga hanga i raro i ngā wāhanga mikroskopika, e hanga ana i ngā pātengi pai me te kitea i runga i ngā kanohi anake, engari kāore i te taea te whakaawe i te hanga i waho i ngā pūkaha hanga matua. He mea nui ake ēnei whakaaetanga haumaru mo ngā tohu, ngā kāwanatanga, me ngā rōpū e hiahia ana ki ngā momo whakamātau kore-kore. Ka taea te whakatakoto i ēnei kēhi me ngā tohu kaiwhakahaere, me ētahi atu whakaaetanga haumaru, me ngā wāhanga e huri ana kia pai ai te whakamahi, mai i ngā kawe ā-hoko ki ngā tuhinga ture. Ko tō rātou whanaketanga e tiaki ana i te wā e huringa nei, me ngā pūtake whakamātau e kitea ana ngā tohu kīwai o te whakamahi rerekē rānei.