Kwiminyaka yakutshanje, ilizwe lokunyamekela kwamehlo livuyiswe ngamalensi e-scleral contact. Iilensi zokudibanisa ze-scleral zininzi zerhasi ezinzima ( RGP) ezingapheliyo (i- RGP) ezingabonakali nje kuphela i-cornea kodwa zandisa ukufikelela kwinxalenye enkulu ye-sclera, inxalenye emhlophe yeso. Iimitha eziqhelekileyo zegesi ezinobungakanani bemitha engama-9.0 mm ububanzi. Iilensi ze-scleral ziyahluka ukusuka kwi-14 ukuya kwi-20 mm ububanzi.
Ukufumana ulungelelwaniso olulungeleyo kunye ne-gesi eqinekileyo yentsholongwane yentsholongwane ngamanye amaxesha kunzima ngenxa yentshukumo yendalo ye-cornea. Nangona kunjalo, i-lens scleral ihleli kwi-sclera endaweni yoko, ukwenzela ukuba i-curvature ye-lens inendima encinci ngendlela ehambelana nayo.
Iinzuzo zoLwazi lweeNkcukacha zoLuntu
I-lens yokuxhamla i-scler ngokuvamile ikhululekile ukugqoka kunama-lens encinci ye-RGP. I-cornea izaliswe ngamawaka emigqomo yentsholongwane eyenza ibe yintsholongwane kakhulu kwindalo. Ngenxa yokuba ibuhlungu kangaka, abaninzi abantu banokuziva beqhekeza i-lens rhoqo xa behamba ngeenxa. I-lens yesiklaza ihlala ingakumbi kwi-conjunctiva kunye ne-sclera. I-conjunctiva yinto engathandekiyo ngakumbi kune-cornea, ukuvelisa ngokungazi kakuhle kunye nokuphazamiseka. Isigulane esifumana i-gesi egxininisekayo i-lens engenakunyaniseki ingakwazi ukugqoka i-lens scleral ngokukhawuleza kungabi nantoni.
Enye inzuzo yokugqoka i-lens yokuthintana ne-scleral yile mvume yile lensi ukuvelisa umbono ocacileyo.
Ngenxa yokuba i-lens yolwelwe ayihlali ngqo kwi-cornea ngokwayo, i-reservoir yamanzi ikhefu iyadalwa phantsi kwe-lens. Le mithombo isebenze ukukhusela i-cornea kwaye inokuthi ibe yintambo.
Kwakhona, ezinye iimeko zamehlo, ezifana ne-keratoconus okanye i-pellucid, i-cornea ibe yinto engavamile kwaye ngamanye amaxesha kakhulu.
Iilensi zamachiza eziqhelekileyo zinzima ukubeka isikhala kwi-cornea engavumelekanga. Nangona kunjalo, akunakwenzeka ukuba i-lens scleral ihlonipheke ngenxa yokuba igubungela kude kude ne-cornea.
Ngaba i-Lens Contact Lens New?
Okuthakazelisayo, i-lens yokuqala yee-lens eziye zaveliswa ngasekupheleni kwee-1800 zazingekho iilensi zokudibanisa. Iyona ndlela ebaluleke kakhulu yendlela yokubheja kwesikhansela ebhekene neendlela zokubamba umboniso okanye ukuphazamiseka kwamehlo. Ezi iilensi zokuqala zenziwe ngeplastiki kunye neglasi kwaye azivumelanga i-oksijini ukuba ijikeleze okanye ijikeleze i-lens ukuya kwi-cornea. Ngoko ke, iilensi zenziwe zincinci kwaye zenzelwe ukuhlala kuphela kwi-cornea. Nangona kunjalo, la ma-lense ngezinye iinkhathi kubangela ukuphazamiseka okuphawulekayo okanye ukungafanisi kwezigulane ezinezifo zamehlo. Kwaye kunzima ukuyila i-curvature efanelekileyo ukuze kulungele i- cornea ngokuchanekileyo. Ubugcisa bekhompyutheni banamhlanje buguqulele le nkqubo yokuvelisa nokuyila.
Oko Okufanele Uyazi
Ukuba ukhetha ukuzama ii-lens zokuxhamla kwe-scleral, ugqirha lakho kwiliso liya kufuneka ukuba lenze uvavanyo lwamehlo lwezonyango. Ngexesha loviwo, iimephu zeekhomputha zeekhompyutheni zamehlo akho ziya kuphuhliswa kwaye iifoto ezichanekileyo ziya kuthathwa ngamehlo akho.
Uya kufuneka kwakhona ukuba ulungelelanise i-lens yokuthintana ne-scleral. Emva kokulinganisa iparameters ze-lens, ukuveliswa kwee-lens zakho zokuqhagamshelana ziqala. Kwezinye iimeko, i- inshorensi yezempilo yamehlo inokubambisa iindleko ze-lens zokudibanisa. Ukuba ufanelekile ngala ma-lens ngaphandle kwemfuneko yonyango, cela udokotela wakho wezilwanyana ukuba abuze ukuba umgaqo-nkqubo wakho we-inshorensi uhlanganisa i-lens yokudibanisa kunye nezinto eziphathekayo.
> Umthombo:
> Van der Worp, E. Isikhokelo sokuLungisa iLenkile yokuLungisa. Umbutho wezemfundo zeLens Scleral; 2010.