Haeba u khetha ho roala lilense tsa sefahleho ho e-na le likhalase ho ntlafatsa pono ea hau, ho na le mefuta e mengata eo u ka khethang ho eona

Haeba u khetha ho roala lilense tsa sefahleho ho e-na le likhalase ho ntlafatsa pono ea hau, ho na le mefuta e mengata eo u ka khethang ho eona.
Ka bobeli lilense tse thata le tse bonolo li na le melemo le melemo ea tsona.Ke efe e nepahetseng bakeng sa hau e ka itšetleha ka litlhoko tsa hau tsa pono, mokhoa oa bophelo le likhetho tsa hau.
Haeba u nahana ka lilense tse thata, bala ho ithuta ka melemo le likotsi tsa lilense tsena le ho li sebelisa ka mokhoa o sireletsehileng.
Mofuta o sebelisoang ka ho fetisisa oa li-lenses tse thata tsa ho kopana ke li-lenses tse thata tsa khase (RGP) li phutholohile ebile li sireletsehile ho apara ho feta mefuta ea pele ea lilense tse thata, tse kang lilense tse tloaelehileng tsa polymethylmethacrylate (PMMA).
Lilense tsa RGP li entsoe ka thepa ea polasetiki e tenyetsehang eo hangata e kenyelletsang silicone. Thepa ena e bobebe e lumella oksijene hore e fete ka ho toba ka lense ho ea leihlong la hau.
Leihlo la hao ke karolo e ka ntle ea leihlo la hao e bonaletsang ka holimo. Leihlo la hao le ntša khanya 'me le sebetsa joaloka lense e ka ntle ea leihlo la hao. mathata a mang a mahlo.

Lilense tsa PMMA ha li lumelle oksijene ho feta ka har'a lilense. Tsela feela eo oksijene e ka fihlang cornea ka eona ke haeba meokho e phalla ka tlas'a lense nako le nako ha u panya.
E le ho lumella meokho hore e tsamaee tlas'a lense, lilense tsa PMMA li batla li le nyane ka boholo. Hape, ho tlameha ho be le lekhalo pakeng tsa lense le cornea. , haholo-holo ha u ikoetlisa.
Hobane lilense tsa RGP li lumella oksijene ho feta ho tsona, lilense tsena li kholo ho feta lilense tsa PMMA 'me li koahela mahlo a mangata.
Ho phaella moo, lithako tsa lilense tsa RGP li lumellana haholoanyane le holim'a mahlo a hau.Sena se etsa hore ba phutholohe ho apara ho feta mehlala ea khale.E boetse e lumella lilense hore li lule li le mahlong a hao ka mokhoa o sireletsehileng haholoanyane.
Liphoso tse refractive li etsahala ha sebōpeho sa leihlo la hao se thibela khanya e kenang hore e se tsepame hantle ho retina. Retina ke lera la linama tse ka morao ho leihlo.
Ho roala lilense tse thata tsa RGP ho ka lokisa mefuta e mengata ea liphoso tsa refractive, ho kenyelletsa:
Lilense tse thata tsa RGP li na le melemo e mengata ho feta lilense tse bonolo tsa ho ikopanya. Ha re shebe melemo ena ka botlalo:
RGP rigid contact lens le tsona li na le mefokolo e itseng.Mathata a mang a tloaelehileng ka lilense tsena ke ana.
Haeba u batla hore lilense tse thata tsa ho kopana li tšoarelle nako e telele kamoo ho ka khonehang, ke habohlokoa hore u li hlokomele hantle.
Lilense tse thata tsa khase (RGP) ke mofuta o tloaelehileng ka ho fetisisa oa lense ea ho kopana e thata e behiloeng kajeno. Ka kakaretso li fana ka pono e matla, e bohale ho feta lilense tse bonolo.

Hape, maemo a mang, ho kenyelletsa le astigmatism, a ka lokisoa ka katleho ka lilense tse thata tsa ho kopana.
Leha ho le joalo, ho roala lilense tse thata hangata ho nka nako e telele ho tloaela, 'me li ka' na tsa se ke tsa phutholoha joaloka lilense tse bonolo.Bua le ngaka ea hau ea mahlo ho fumana hore na ke mofuta ofe oa lense o molemo ka ho fetisisa bakeng sa hau le litlhoko tsa hau tsa pono.
Ho sesa ka lilense tsa ho kopana ho ka u thusa ho bona hantle, empa ho eketsa kotsi ea mathata a mang a amanang le mahlo, ho tloha ho leihlo le omeletseng ho isa ho a tebileng…
Mabitso a theolelo a fana ka mefuta e mengata ea lihlahisoa, litheko tse tlase haholo, 'me ho bonolo ho sebelisa sebaka sa marang-rang.Ke eng hape eo u ka e tsebang mona.
Ho na le libaka tse ngata tsa ho reka likhalase inthaneteng.Ba bang ba na le mabenkele a mabenkele moo u ka rekang teng.
Haeba u batla ho reka lilense tsa marang-rang, libaka tse lethathamong lena li na le rekoto e ts'oanang ea ho khotsofatsa bareki le ho nka lilense tsa boleng bo holimo…