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1.67 Spin Photochromic Gray HMC Optical arotahi
Ko ngā karāhe huri-tae, e mōhiotia ana ko ngā "karāhe whakaahua-arotahi". E ai ki te mātāpono o te tauhohenga whakahurihuri whakaahua-kāhua, ka taea e te karāhe te pōuri wawe i raro i te mārama me te hihi ultraviolet, te aukati i te mārama kaha me te mimiti i te mārama ultraviolet, me te whakaatu i te mimiti koretake o te mārama e kitea ana. Ka hoki ki te pōuri, ka taea te whakahoki wawe i te āhua mārama kore-tae, me te whakarite i te whakawhiti o te karāhe. Nō reira, he pai ngā karāhe huri-tae mō te whakamahi i roto, i waho hoki i te wā kotahi hei ārai i te kino o te rā, te mārama ultraviolet me te kanapa ki ngā kanohi.
