Labo abagqoke ama-lens othintana nabo isikhathi eside bayazi ukuthi bangakhathali kanjani amehlo abo. Lokhu kwenzeka, okokuqala, ngenxa yokungena embi kwe-oksijeni ku-cornea. Amalensi e-silicone-hydrogel axazulule le nkinga ngokuphelele - ngokungafani nama-lens ajwayelekile we-hydrogel lens, avumela amehlo ukuba ahlanganyele ngokugcwele ekushintsheni kwe-oxygen.
Imikhiqizo engcono kakhulu yokukhiqiza i-silicone-hydrogel lens
Okuqukethwe kwamanzi we-hydrogel kanye ne-silicone-hydrogel contact lens cishe kufana, kepha inkomba uDk / t iyinani le-oksijeni elimele ukukhanya kwamalensi phakathi nendawo - lesi samuva singaba izikhathi eziningana ngaphezulu. Isibonelo: I-PureVision lens kusuka ku-Bausch & Lomb kusuka ku-silicone hydrogel ine-Dk 110, ne-hydrogel lens ye-firm efanayo yaseMelika, kodwa kusukela ochungechungeni lwe-SofLens 59 ingaqhayisa i-coefficient oksijini conductivity ye-16.5 kuphela. Kokubili lezo kanye nezinye iilensi zenzelwe ukushintshwa nyangazonke.
Ama-lensi aphezulu kakhulu avela ku-silicone hydrogel atholakala kubakhiqizi abakhulu:
- Ciba Vision;
- I-Alcon;
- I-Bausch & Lomb;
- Cooper Vision;
- Zeiss.
Unomzila wensuku elilodwa-silicone-hydrogel lenses nama-lens okugqoka isikhathi eside. Ngenxa yamanani aphezulu e-Dk, kwaba lula ukugqoka amalensi oxhumana nabo izinyanga ezimbalwa. Manje awukwazi ukususa i-lens ebusuku ngaphandle komonakalo emehlweni. Isixazululo se-silicone-hydrogel lens asifani nokujwayelekile.
I-color silicone-hydrogel lens
Ngenxa yokuthi ama-lens ahlanganisiwe afaka i-pigment, ikhono labo lokuqhuba i-oksijini liyancipha kakhulu. Ngisho ngokungeza abicah ku-hydrogel, inkinga ayikwazi ukuxazululwa ngokuphelele - amalensi ombala akakwazi ukugqoka isikhathi eside kunamahora angu-12 ngokulandelana. Noma kunjalo, zijabulisa kakhulu emehlweni ethu. Amalensi ombala athandwa kakhulu avela ku-silicone hydrogel - Air Optix Umbala kusuka enkampanini yase-American Alcon.