Ntlha ea pele, nahana ka moralo oa likhalase tsena tsa mahlo. E na le moralo oa setso o lumellanang le boholo ba libopeho tsa sefahleho sa batho. Likhalase tsena tsa optical li tla le lilense tsa mahlaseli a mahlaseli a mahlaseli a letsatsi tse ka fetohang kapele le ha bonolo, tse u lumellang ho boloka pono e ntle maemong a fapaneng a mabone. Moqapi ona ha o sebetse feela ebile o sebetsa, empa o boetse o fana ka mokhoa oa ho ama likhalase tsa mahlo.

Ntle le setaele sa eona se secha, likhalase tsena tsa letsatsi li na le ts'ebetso e ikhethang. Lilense tsa eona li sirelelitsoe ke UV400, tse thibelang mahlaseli a mangata a letsatsi le mahlaseli a kotsi le ho sireletsa mahlo a hau kotsing. Likhalase tsena tse holim'a likhalase tsa mahlo li ka u fa tšireletso e tšepahalang ea mahlo ho sa tsotellehe hore na u etsa mesebetsi ea ka ntle kapa u etsa mesebetsi ea hau ea letsatsi le letsatsi.

Ho feta moo, foreimi e entsoe ka acetate, e seng feela e nang le sebopeho se phahameng empa hape e fana ka tšireletso e molemo bakeng sa likhalase tsa letsatsi. Ho feta moo, foreimi e entsoe ka hinge ea tšepe ea tšepe, e etsang hore e phutholohe ho e roala, e se ke ea senyeha, 'me e be matla haholoanyane.

Ka kakaretso, lipono tsena tsa "magnetic clip-on" li na le setaele se sejoale-joale ebile li na le bokhoni ba ho thusa, empa li boetse li etelletsa pele boiketlo le ho tšoarella. Ke likhalase tsa letsatsi tse loketseng mesebetsi e fapaneng, ho kenyelletsa lipapali tsa kantle, ho khanna, le bophelo ba letsatsi le letsatsi, 'me li ka u fa pono e hlakileng le e monate hammoho le ts'ireletso e tiileng ea mahlo.

Haeba u batla likhalase tsa setaele tse sebetsang hantle, likhalase tsena tsa makenete ke khetho e ntle haholo. Potlaka 'me u ithekele sete ea hau ea likhalase tsa mahlo tsa makenete e le hore u bone hantle le hamonate le letsatsing!