Silicone daim ntawv thov nyob rau hauv daim ntawv lo
Silicone daim ntawv thov nyob rau hauv cov ntaub ntawv lo ntsiab muag, tshwj xeeb tshaj yog cov xim lo ntsiab muag, feem ntau yog tshwm sim hauv cov khoom siv tshiab thiab kev ua tau zoo. Txawm li cas los xij, nws tseem ceeb heev uas yuav tsum nco ntsoov tias cov khoom siv ncaj qha hu ua "silicone contact lenses" tsis yog ntau heev. Cov ntaub ntawv siv rau cov lo ntsiab muag yog feem ntau nyuaj thiab ntau yam, suav nrog hydrogels, cov ntaub ntawv tsis-ionic, thiab silicone hydrogels. Ntawm cov no, silicone hydrogel lo ntsiab muag, uas ua ke cov khoom ntawm silicone thiab hydrogel, tuav ib qho tseem ceeb hauv kev lag luam lo ntsiab muag.
Daim ntawv thov ntawm silicone nyob rau hauv lub qhov muag lo ntsiab muag tuaj yeem ua tiav hauv cov hauv qab no:
Txhim kho Oxygen Permeability: Silicone yog cov khoom siv hydrophobic tsis tau oxygen, lub ntsiab lus nws tso cai rau oxygen ntau dhau los ntawm lub lens mus rau lub pob kws. Qhov no txhim kho cov pa permeability ntawm lub qhov muag lo ntsiab muag, uas yog qhov tseem ceeb rau cov tib neeg uas hnav lo ntsiab muag rau lub sijhawm ntev, vim nws pab txo qis kev pheej hmoo ntawm corneal hypoxia thiab tiv thaiv qhov muag kev noj qab haus huv.
Txhim khu kev ruaj ntseg: Silicone-based contact lenses feem ntau muaj cov khoom khaws cia zoo dua, pab ua kom lub qhov muag tsis muaj dej thiab txo qhov qhuav. Qhov no yog ib qho tseem ceeb kom zoo dua rau cov neeg uas muaj qhov muag qhuav.
Txhim kho kev nplij siab: Txawm hais tias silicone-raws li lo ntsiab muag tej zaum yuav pib nruj me ntsis, niaj hnub silicone hydrogel tiv thaiv lo ntsiab muag tau ua kom zoo dua los ntawm kev txhim kho thev naus laus zis thiab kho cov khoom siv. Cov lo ntsiab muag tam sim no muab kev nplij siab zoo thaum tswj cov pa oxygen permeability siab. Qee lub tuam txhab kuj tau ua kom zoo dua qhov tsim thiab kho qhov chaw ntawm lub lo ntsiab muag kom ntxiv dag zog rau kev nplij siab.
Nws tsim nyog sau cia tias tsis yog txhua lub lo ntsiab muag nrog lo lus "silicone" hauv lawv lub npe yog qhov tseeb silicone hydrogel lo ntsiab muag. Qee cov khoom lag luam tsuas yog muaj me me ntawm silicone los txhim kho lub lens shaping thiab hnav kev paub, tsis muaj kev txhim kho oxygen permeability lossis khaws cia noo noo. Yog li ntawd, thaum xaiv cov lo ntsiab muag, cov neeg siv khoom yuav tsum ua tib zoo tshuaj xyuas cov khoom piav qhia thiab cov khoom muaj pes tsawg leeg kom nkag siab txog lub lens qhov ua tau zoo.
Tsis tas li ntawd, vim tias cov iav tiv thaiv tau muab cais ua cov khoom siv kho mob uas muaj kev pheej hmoo siab (Class III) los ntawm cov tswj hwm kev tswj hwm, nrog rau cov khoom siv xws li pacemakers, lawv txoj kev nyab xeeb thiab kev ua tau zoo yog tswj hwm nruj. Cov neeg tau txais kev pab yuav tsum yuav cov iav tiv thaiv los ntawm cov npe nrov thiab cov channel, ua raws li cov lus qhia thiab kev taw qhia ntawm cov kws kho mob, thiab ua kom lub qhov muag zoo thiab kev nyab xeeb.