Fana ka lethathamo la mefuta e fapaneng ea lilense tse nang le matheba
Context:Tsela eo Lense e Bonolo e Etsoang ka Eona  Boholo ba lilense ke lilense tse chitja: mahlakore a tsona a mabeli ke likarolo tsa mahlakore a li-sphere. Karolo e 'ngoe le e 'ngoe e ka ba e pharaletseng (e hlahelletseng ka ntle ho lense), e pharaletseng (e kenelletseng lense), kapa e bataletseng (e bataletseng). Mohala o kopanyang litsi tsa li-sphere tse etsang bokaholimo ba lense o bitsoa selekane sa lense. Ka tloaelo lense ea lense e feta bohareng ba lense, ka lebaka la tsela eo li entsoeng ka eona. Lilense li ka 'na tsa khaoloa kapa tsa siloa ka mor'a hore li etsoe hore li be le sebōpeho kapa boholo bo fapaneng. Ka nako eo lense ea lense e ka 'na ea se ke ea feta bohareng ba lense.  Lilense tsa toric kapa tsa sphero-cylindrical li na le bokaholimo bo nang le li-radius tse peli tse fapaneng tsa ho kobeha lifofaneng tse peli tsa orthogonal. Li na le matla a fapaneng a ho tsepamisa mohopolo ho li-meridian tse fapaneng. Sena se etsa lense ea astigmatic. Mohlala ke lilense tsa likhalase tsa mahlo tse sebelisetsoang ho lokisa bothata ba ho se bone hantle mahlong a motho e mong.
Tse latelang ke mefuta e sa tšoaneng ea lilense: - Convex: E kobehile ho tloha bohareng ba lense - Concave: E kobehile bohareng ba lense - Planar: lense e bataletseng