Kev xaiv cov iav tsom iav kom raug yuav tsum tau tsom mus rau ob peb lub ntsiab lus tseem ceeb. Lub cornea, uas yog txheej sab nraud tshaj plaws ntawm lub qhov muag, yog mos thiab ywj. Txawm hais tias nws tsuas yog ib nrab millimeter nyias xwb, nws cov qauv thiab kev ua haujlwm yog qhov nyuaj heev, muab 74% ntawm lub qhov muag lub zog refractive. Vim tias cov iav tsom iav sib chwv ncaj qha rau ntawm qhov chaw ntawm lub corneal, kev hnav lawv yeej cuam tshuam rau qhov cornea qhov kev nqus oxygen mus rau qee qhov. Yog li ntawd, kev xaiv cov iav tsom iav yuav tsum tsis txhob saib tsis taus.

Hauv qhov no, cov kws kho mob pom zoo kom ua tib zoo mloog cov cim qhia hauv qab no thaum xaivcov iav sib cuag:

Khoom siv:
Yog xav kom xis nyob, xaiv cov khoom siv hydrogel, uas haum rau feem ntau cov neeg hnav txhua hnub, tshwj xeeb tshaj yog cov neeg uas nyiam xis nyob. Yog xav hnav ntev, xaiv cov khoom siv silicone hydrogel, uas muaj cov pa oxygen permeability siab thiab zoo tagnrho rau cov neeg uas siv sijhawm ntev nyob ntawm lub computer.

Cov Ncej Pib:
Yog tias koj tsis tau hnav cov iav sib cuag ua ntej, koj tuaj yeem mus ntsib kws kho qhov muag lossis lub khw muag khoom siv kho qhov muag kom kuaj xyuas. Yuav tsum xaiv qhov nkhaus ntawm cov iav raws li qhov nkhaus ntawm lub ntsej muag pem hauv ntej ntawm lub qhov muag. Feem ntau, qhov nkhaus ntawm 8.5mm txog 8.8mm yog qhov pom zoo. Yog tias cov iav swb thaum hnav, feem ntau yog vim qhov nkhaus loj dhau. Ntawm qhov tod tes, qhov nkhaus me dhau tuaj yeem ua rau khaus qhov muag thaum hnav ntev, cuam tshuam rau kev sib pauv kua muag, thiab ua rau muaj cov tsos mob xws li hypoxia.

Kev Nkag Tau Pa oxygen:
Qhov no hais txog lub peev xwm ntawm cov khoom siv lens kom tso cai rau cov pa oxygen hla dhau, feem ntau yog qhia ua tus nqi DK / t. Raws li Lub Koom Haum Thoob Ntiaj Teb ntawm Cov Kws Qhia Txog Lens, cov lens pov tseg txhua hnub yuav tsum muaj qhov permeability oxygen ntau dua 24 DK / t, thaum cov lens ntev-hnav yuav tsum tshaj 87 DK / t. Thaum xaiv cov lens, xaiv cov uas muaj cov pa oxygen ntau dua. Txawm li cas los xij, nws yog ib qho tseem ceeb kom paub qhov txawv ntawm oxygen permeability thiab oxygen transmissibility:Kev Kis Tau Pa = Kev Kis Tau Pa / Qhov Nruab NrabTsis txhob cia tus nqi oxygen permeability uas teev nyob rau ntawm lub ntim khoom yuam kev.

Cov ntsiab lus dej:
Feem ntau, cov dej uas muaj nyob hauv thaj tsam li ntawm 40% txog 60% yog qhov tsim nyog. Tsis tas li ntawd xwb, cov thev naus laus zis zoo dua los khaws cov dej noo ntawm lub lens tuaj yeem ua rau kom xis nyob thaum hnav. Txawm li cas los xij, nco ntsoov tias cov dej ntau dua tsis yog qhov zoo dua tas li. Txawm hais tias cov dej ntau dua ua rau lub lens mos dua, nws tuaj yeem ua rau lub qhov muag qhuav dua thaum hnav ntev.

Hauv kev xaus lus, kev xaiv cov iav tsom iav yuav tsum xav txog koj tus kheej qhov muag mob, kev coj ua, thiab kev xav tau. Ua ntej hnav lawv, mus kuaj qhov muag thiab ua raws li koj tus kws kho mob cov lus qhia kom paub tseeb tias qhov muag noj qab haus huv.