Re thabetse ho tsebahatsa boqapi ba rona ba morao-rao, likhalase tsa acetate optical tsa magnetic clip-on acetate. Thepa ea foreimi bakeng sa likhalase tsena ke acetate ea boleng bo phahameng, e nang le sebopeho se eketsehileng le ho tšoarella. Foreimi e entsoe ka bokhabane, e feshene ebile e na le sebaka, e etsa hore e tšoanele libopeho tsohle tsa sefahleho le ho u lumella ho lula u khahleha u bile u phutholohile letsatsing.
Lipontšo tsena tsa li-clip-on le tsona li ka kopanngoa le likotoana tsa letsatsi tsa makenete ka mebala e fapaneng, e u lumellang ho li kopanya le ho li bapisa ho latela maemo a fapaneng le likhetho tsa motho, ho bonts'a mekhoa le botho bo fapaneng. E ka phethahatsa litlhoko tsa hau tse fapaneng, ebang ke tse botala bo hlakileng, boputsoa bo makatsang, kapa lilense tsa pono ea bosiu.
Lilense li entsoe ka thepa ea UV400, e ka sireletsang mahlo a hau hamolemo mahlaseling a UV le maboneng a khanyang, e u fang sebete le ho phutholoha haholoanyane ha u le ka ntle. Khalase ena e holim'a mahlo e ka sireletsa mahlo hohle, ea u fa monyetla oa ho thabela letsatsi ha u ntse u phetse hantle, ho sa tsotellehe hore na u phomolong ea leoatle, u bapala lipapali tsa ka ntle, kapa u tsamaea kamehla.
Ho fapana le likhalase tsa letsatsi tse tloaelehileng, likhalase tsena tsa optical li kopanya bokhoni ba likhalase tsa optical le likhalase tsa letsatsi, ho felisa tlhoko ea ho nka likhalase tse peli le ho u lumella ho ikamahanya le maemo a mabone a fetohang. Likhalase tsa likhalase tsa mahlo li ka phethahatsa litlhoko tsa hau tsa pono ka tlung kapa ka ntle, tsa u fa pono e hlakileng le boiphihlelo bo monate.
Ka bokhutšoanyane, likhalase tsa rona tsa li-clip-on ha li shebahale hantle feela ebile li entsoe ka thepa ea boleng bo holimo, empa li boetse li fana ka tšireletso e feletseng ea mahlo le phihlelo ea ho apara hantle. Likhalase tsena tsa mahlo li ka lumellana le litlhoko tsa hau ho latela mekhoa ea feshene hammoho le ts'ebetso ea ts'ebetso, tse u lumellang ho hlahisa boits'epo le botle ketsahalong efe kapa efe. Khetha lihlahisoa tsa rona ho boloka mahlo a hau a phetse hantle 'me a le monate ka linako tsohle!