Likhalase tse theko e boima - sethabathaba ho feshene kapa ehlile ke mokhoa oa ho itšireletsa letsatsing? A na u lokela ho boloka likhalase tsa letsatsi? Bo-rasaense ba entse liteko mme ba fumana hore lilense tse theko e tlaase li kotsi bophelong.
Likhalase tse theko e tlaase li ka 'na tsa bonahala li le theko e boima, empa potso ke hore, haeba li le ntle, ke hobane'ng ha li le theko e tlaase hakaale? Litsebi tsa British Standards Institute li ile tsa etsa thuto e sa tloaelehang: li ile tsa reka likhalase tse 15 tsa likhalase tse theko e tlaase 'me tsa fumana hore na ke mathata afe a ka patoang ka mor'a lilense tsa bona tse lefifi.
Hoa hlokahala ho sireletsa mahlaseli a ultraviolet eseng feela letlalo, empa le mahlo. Leha ho le joalo, hase likhalase tsohle tse sebetsanang le mosebetsi ona.
Kahoo, bonyane tšitiso ea likhalase tse theko e tlaase li ka baka ke mahlo a arohaneng le hlooho e opang. Likhalase tse ling, ho ile ha fumanoa seo ho thoeng ke li-prism tse emeng ka har'a lilense. Ka linako tse ling tsena li sebelisoa meriana, empa li laeloa ka thata ho ea ka lengolo la ngaka ea mahlo. Hore na lilense tsena li kene joang liforeimi tsa likhalase tse tloaelehileng ha ho hlake. Leha ho le joalo, tsena hase likotsi kaofela. Ntle le ho opeloa ke hlooho, likhalase tsa letsatsi li ka baka mafu a tebileng. Bala haholoanyane
Ho molemo ho reka likhalase tse theko e boima ho feta tse peli tsa theko e tlaase.
Tlhahlobo ea likhalase tse khethehileng tsa letsatsi bakeng sa ho khanna e bontšitse hore boholo ba mehlala e na le lilense tse lefifi haholo. Hape, litsebi li ile tsa makala ha li fumana hore likhalaseng tse ngata, lilense tse ka ho le letona le le letšehali li fetisa khanya e sa tšoaneng. Litsebi li ile tsa fihlela qeto ea hore likhalase tse joalo li ka lebisa eseng feela hloohong, empa hape le mathata a tebileng, mohlala, ho astigmatism.
Qetello: ho molemo ho reka likhalase tse theko e boima le tsa boleng bo phahameng ho feta lipara tse 'maloa tsa theko e tlaase le ho senya mahlo a hau.
Litsebi tse tsoang Brithani li khothalletsa hore ha u reka likhalase tsa letsatsi, hlahloba letšoao la CE, leo, ka tsela, le tlamang bakeng sa lihlahisoa tse rekisoang ho pholletsa le European Community.
Ka tsela, likhalase tsa mahlaseli ke ntho e ratoang ke batho ba tummeng e ba thusang eseng feela empa le ho tsoa ho baqolotsi ba litaba.