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Vim li cas thiaj xaiv silicone hydrogel contact lenses?

Txawm hais tias tus naj npawb ntawm cov tshuaj tiv thaiv hydrogel yog qhov zoo dua, lawv ib txwm ua tsis txaus siab ntawm cov pa permeability.Los ntawm hydrogel mus rau silicone hydrogel, nws tuaj yeem hais tau tias qhov zoo tshaj plaws tau ua tiav.Yog li, raws li qhov zoo tshaj plaws kev sib cuag lub qhov muag tam sim no, dab tsi zoo li silicone hydrogel?

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Silicone hydrogel yog cov khoom siv hydrophilic organic polymer nrog siab oxygen permeability.Los ntawm kev xav ntawm qhov muag kev noj qab haus huv, qhov teeb meem tseem ceeb uas cov lo ntsiab muag yuav tsum tau hais txog yog txhawm rau txhim kho oxygen permeability.Ordinary hydrogel contact lo ntsiab muag cia siab rau cov dej uas muaj nyob rau hauv lub lens raws li tus neeg nqa khoom xa oxygen mus rau lub cornea, tab sis lub peev xwm thauj cov dej yog tsawg heev thiab evaporates kuj yooj yim.Txawm li cas los xij, qhov sib ntxiv ntawm silicon ua rau muaj qhov sib txawv loj.Silicone monomersmuaj cov qauv xoob thiab tsis muaj zog intermolecular, thiab solubility ntawm oxygen nyob rau hauv lawv yog siab heev, uas ua rau cov pa permeability ntawm silicone hydrogels ntau npaum li tsib zaug siab dua li cov lo ntsiab muag zoo tib yam.

Qhov teeb meem uas oxygen permeability yuav tsum nyob ntawm cov ntsiab lus dej tau raug daws,thiab lwm yam zoo tau raug coj los.

Yog tias cov ntsiab lus dej ntawm cov lo ntsiab muag zoo ib yam yog nce, raws li lub sij hawm hnav nce, cov dej evaporates thiab rov qab los ntawm cov kua muag, ua rau qhuav ntawm ob lub qhov muag.

Txawm li cas los xij, silicone hydrogel muaj cov ntsiab lus dej kom zoo, thiab cov dej tseem ruaj khov txawm tias tom qab hnav, yog li nws tsis yooj yim los ua kom qhuav, thiab cov lo ntsiab muag yog mos thiab xis nyob thaum tso cai rau lub cornea ua pa dawb.

Raws li qhov tshwm sim

Cov tshuaj tiv thaiv kab mob ua los ntawm silicone hydrogel yeej ib txwm hydrated thiab ua pa, txhim kho kev nplij siab thiab txo kev puas tsuaj rau lub qhov muag, qhov zoo uas tsis sib haum los ntawm kev sib tiv tauj lo ntsiab muag.Txawm hais tias silicone hydrogel tsuas yog siv los ua lub voj voog luv luv thiab tsis tuaj yeem siv rau cov khoom pov tseg txhua xyoo thiab ib nrab xyoo, nws tseem yog qhov kev xaiv zoo tshaj plaws ntawm txhua yam khoom.

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Post lub sij hawm: Aug-16-2022