He maha ngā pai me ngā pūtake matua o ngā kōpaki tohora i hangaia hei whakamana i te whakapono, mō ngā pēhea me ngā kaiwhakamahi anō hoki. Tuatahitia rawa atu, he mea tino tiakina nui ake ina whakaaetia ngā āhuatanga tirotirohanga oneone o enei kōpaki, e mahi ana ki te whakarite i ngā taonga me ngā paetae ki te whakaeke ki te hanga i waenganui i te mana motuhake. Ko ngā āhuatanga optika ātaahua o enei kōpaki ka hangaia he kaiwhakaawe i te kanohi, ka taea te whakamana i ngā āhuatanga tirotirohanga me ngā āhuatanga hoahoa e kitea ana i te matawhāiti. Ko te whanaketanga o ngā kōpaki tohora ka taea te whakamana i te wā e huringa ana, ka noho tonu i te āhuatanga kanohi me te whakamana, ahakoa ngā take huringa. Ko tō rātou whanaketanga ka taea te whakamahi i runga i ngā whenua rerekē, mai i ngā taonga raruraru ki ngā rongoā, ki ngā mea whakapā ki ngā tuhinga ture. Ko ngā whiringa karekau e taea te whakamahi i ngā kōpaki tohora, ka taea te whakauru i ō rātou āhuatanga pakihi, ko ngā tohu, ko ngā kupu, ko ngā āhuatanga hoahoa motuhake, ahakoa ngā āhuatanga tirotirohanga. Ko ngā āhuatanga whakaekea ka tuku whakaatu ā-kanohi i te whaimana o ngā whakaritenga katoa, ka whakamana i te whaimana o te taonga mō ngā wā e toro nei i roto i te rīpoata kai. Mai i te tirohanga moni, he whakapiki tino paihere i te hokohoko, e whakamana ana i ngā take: tirotirohanga, pakihi, me te whakapai ā-waro. Ko te mahi whakamahi, e tika ana me te iti, kaore i te hiahia ki te whakamahi i ngā rautaki tino whakatupu, ka whakaiti i ngā utu whakamahi. Ahakoa, ka whakapai i te mana pakihi ki te whakamana i te whakaaturanga rangatira me te whakaae ki te tirotirohanga o te taonga. Ko tō rātou whiuwhenua ka taea te whakamana i te wā e huringa ana i ngā take whakamahere me ngā take whakaatu, ka taea te whakamahi mō ngā wā i roto i te whare me ngā wā i waho.