Eminyakeni yamuva, izwe lokunakekelwa kwamehlo lijabule ngama-lens okuthintana nama-scleral. Amalensi okuxhumana amakhanda ama-lens angama-lens agcwele amagesi aqinile ( RGP) angagcini nje kuphela i-cornea kodwa futhi ayenezela ukumboza ingxenye enkulu ye-sclera, ingxenye emhlophe yeso. Amapayipi angama-lens angama-9.0 mm ububanzi obuvamile. Ama-lens amakhanda ahluka kusuka ku-14 kuya kwangu-20 mm ububanzi.
Ukuthola uvumelwane olukhululekile nge-lens eqondile yegesi elimelelekayo ngezinye izikhathi kunzima ngenxa yokuvinjelwa kwemvelo kwe-cornea. Kodwa-ke, i-lens yesikhumba ehlezi esihlakalweni esikhundleni salokho, ngakho-ke ukugoba kwe-lens kudlala indima encane ngendlela ehambisana ngayo.
Izinzuzo ze-Scleral Contact Lenses
Ama-lens oxhumana nabo abathintekayo abavame ukukhululeka ukugqoka kunama-lensi amancane okuxhumana no-RGP. I-cornea igcwele izinkulungwane zezintambo zomzimba ezenza kube buhlungu kakhulu emvelweni. Ngenxa yokuthi izwela kakhulu, iningi labantu lingazizwa lens lens njalo lapho lihamba nxazonke. I-lens yesikhumba igxila ngokuyinhloko kwi-conjunctiva ne-sclera. I-conjunctiva ingacabangi kakhulu kune-cornea, ikhiqiza kakhulu ukuqaphela nokungahambi kahle. Isiguli esithola i-lens egxilile i-lens enmeable ingenakubekezelelwa ingakwazi ukugqoka i-lens yesikhumba kalula ngokungahambi kahle.
Enye inzuzo yokugqoka i-lens yokuxhumana yesikhumba yikhono lensiza ukuveza umbono ocacile.
Ngenxa yokuthi i-lens yamakhansela ayihlali ngqo kwi-cornea ngokwayo, indawo yokugcina amanzi ekhanda idalwe ngaphansi kwe-lens. Leli gumbi lisebenza ngokuvikela i-cornea futhi lingase libe yinto yokugcina.
Futhi, ezinye izimo zamehlo, ezifana ne-keratoconus noma i-pellucid ukuwohloka okuncane, kubangela ukuthi i-cornea ibe yinto engavamile futhi ngezinye izikhathi iminyene kakhulu.
Ama-lens amakhorali avamile anzima ukubeka isikhala esingavamile. Kodwa-ke, cishe akunakwenzeka ukuba i-lens yokuklabalaza ihloniphe ngoba idonsa kude kangaka ne-cornea.
Ingabe ama-Lens wokuthintana amasha ayentsha?
Ngokuthakazelisayo, i-lens yokuqala ye-lens eye yaqala ukuphela ngasekupheleni kwawo-1800 yayiyi-lens yokuthintana nama-scleral. I-roadblock enkulu ye-scleral lens ibhekene nokuba indlela evamile yokulungisa umbono noma ukuphazamiseka kwamehlo kwakuyizinto zokwakha. Lezi lens zokuqala zenziwe ngepulasitiki nengilazi futhi azivumelanga umoya-mpilo ukuba ugijime noma ujikeleze i-lens kuya ku-cornea. Ngakho-ke, i-lens yenziwe incane kakhulu futhi yayenzelwe ukuhlala kuphela e-cornea. Kodwa-ke, la ma-lens ngezinye izikhathi abangela ukuphazamiseka okuphawulekayo noma ukungahambi kahle kweziguli ezinezifo ezingaphezulu kweso. Kwakunzima ukuklama isivunguvungu esifanele esidinga ukulingana ne- cornea ngokunembile. Ubuchwepheshe bamuva bekhompuyutha buye benza izinguquko kule nqubo yokukhiqiza nokuklama.
Okufanele Ukwazi
Uma ukhetha ukuzama amalensi othintana ne-scleral, udokotela wakho we-eye uzodinga ukwenza ukuhlolwa kweso lwezokwelapha. Ngesikhathi sokuhlolwa, amabalazwe e-computer ahlose amehlo akho azokwakhiwa futhi izithombe eziningiliziwe zizothathwa ngamehlo akho.
Uzodinga futhi ukuthi uhambele kahle lens yokuxhumana yesikhumba. Ngemuva kokulinganisa imingcele ye-lens, ukukhiqizwa kwama-contact lens akho kungaqala. Kwezinye izimo, umshuwalense wezempilo weso angase uhlanganise nezindleko zama-contact lens scleral. Uma uhambelana nalezi zingqimba ngaphandle kwesidingo sezokwelapha, cela udokotela wakho we-eye ukuthi abuze ukuthi inqubomgomo yakho yomshuwalense inikeza okukhethekile okuthintana nalo lens okuhambisanayo nezinto zokwakha.
> Umthombo:
> Van der Worp, E. Umhlahlandlela wokuLungiswa kweLense lokuGweba. I-Scleral Lens Education Society; 2010.