He rerekē tēnei i ngā mōhiti kanohi noa, i ngā karāhe whakaata-ira rānei e whakaiti noa ana i te kanapa, ka tātarihia e ngā karāhe UV400 ngā hihi mārama katoa me ngā roangaru tae atu ki te 400 nanometer. Kei roto i tēnei ko te UVA, te UVB me te mārama kikorangi kitea-teitei-pūngao (HEV).
Hei whakaaro he mōhiti UV, me ārai ngā karāhe i te 75% ki te 90% o te mārama e kitea ana, ā, me tiaki hoki i te 99% o ngā hihi ultraviolet.
Ko te mea pai ko ngā mōhiti kanohi e tiaki ana i a koe mai i ngā hihi UV 400, nā te mea e tiaki ana i a koe mai i ngā hihi UV katoa.
Kia mōhio koe, ehara i te mea ko ngā mōhiti rā katoa he mōhiti rā tiaki-UV. Tērā pea he karāhe pouri kei roto i tētahi takirua mōhiti rā, ā, tera pea ka ārai i ngā hihi, engari kāore tēnā e kī ana he pai te tiakitanga UV o ngā mōhiti rā.
Mena kāore aua mōhiti kanohi he karāhe pouri kei roto te ārai UV, he kino rawa atu aua atarangi pouri mō ō kanohi i te kore e mau i tētahi mōhiti tiaki. He aha ai? Nā te mea ka taea e te atarangi pouri te whakawhanui i ō kamo, ka nui ake te mārama UV e kitea ana i ō kanohi.
Me pēhea taku mōhio mēnā he ārai UV kei aku mōhiti?
Engari, he uaua ki te kī mēnā he karaihe tiaki-UV ō mōhiti kanohi, ō karaihe arotahi photochromic rānei mā te titiro noa ki aua karaihe.
Kāore hoki e taea te wehewehe i te nui o te tiakitanga i runga i te tae o te arotahi, nā te mea kāore he pānga o te tae, o te pōuri rānei o te arotahi ki te tiakitanga UV.
Ko te mea pai ko te kawe i ō mōhiti ki tētahi toa whatu, ki tētahi whare whakamātautau ngaio rānei. Ka taea e rātou te whakahaere i tētahi whakamātautau māmā ki ō mōhiti hei whakatau i te taumata o te parenga UV.
Ko te kōwhiringa māmā rānei ko te arotahi i tō rapunga ki tētahi kaihanga rongonui, ngaio hoki pērā i a UNIVERSE OPTICAL, me te whiriwhiri i ngā mōhiti kanohi UV400 tūturu, i ngā karaihe photochromic UV400 rānei mai i te whārangi.https://www.universeoptical.com/1-56-aspherical-uv400-q-active-material-photochromic-lens-product/.