1.Raws li qhov chaw ruaj khov ntawm lub lens intraocular hauv lub qhov muag, nws tuaj yeem muab faib ua anterior chamber intraocular lens thiab posterior chamber intraocular lens.anterior chamber intraocular lens (IOL) feem ntau yog cog rau hauv lub chamber posterior vim muaj ntau yam teeb meem tom qab phais.
2.Classification raws li cov khoom ntawm intraocular lens
A. Polymethylmethacrylate (PMMA): polymethylmethacrylate yog thawj cov khoom siv los tsim lub lens intraocular.Nws yog cov khoom siv zoo tshaj plaws rau lub lens tawv intraocular.Nws muaj kev ua haujlwm ruaj khov, lub teeb yuag, zoo pob tshab, thiab yuav tsis degraded los ntawm cov tshuaj lom neeg oxidation ntawm lub cev.Lub refractive index yog 1.49.Qhov tsis zoo yog tias nws tsis tuaj yeem tiv taus qhov kub thiab txias siab.Tam sim no, ethylene oxide roj feem ntau yog siv rau kev tua kab mob, thiab nws qhov kev hloov pauv tsis zoo.Muaj ob hom kev siv tshuaj kho mob: ib qho yog intraocular lens cam khwb cia thiab nias nrog PMMA cov ntaub ntawv ib zaug, uas yog hu ua ib thooj;Qhov thib ob, lub lens optical feem yog ua los ntawm PMMA, thiab lub voj kev txhawb nqa yog ua los ntawm polypropylene, uas yog hu ua peb daim.
B. Silicon gel: nws yog cov khoom tseem ceeb ntawm mos intraocular lens, nrog zoo thermal stability, high-pressure boiling tshuaj tua kab mob, ruaj khov molecular qauv, zoo aging kuj, zoo biocompatibility, softness thiab elasticity.Nws tuaj yeem cog tau los ntawm kev txiav me me.Refractive index ranges ntawm 1.41 txog 1.46.Qhov tsis zoo yog qhov tsis zoo toughness, variability nyob rau hauv mechanical quab yuam, yooj yim los tsim electrostatic nyhuv thiab yooj yim rau absorbing txawv teb chaws teeb meem.
C. Hydrogel: poly (hydroxyethyl methacrylate) yog cov khoom siv hydrophilic, nrog dej cov ntsiab lus ntawm 38% - 55%, mus txog 60%, zoo stability, zoo biocompatibility, kub tsis kam thiab zoo toughness.Lub lens intraocular tuaj yeem ua rau lub cev qhuav dej thiab cog.Tom qab rehydration, nws softness yog rov qab thiab nws linear ntev yog nce los ntawm 15%.Vim nws yog nplua nuj nyob rau hauv dej permeability, intraocular metabolites tuaj yeem nkag mus rau sab hauv thiab ua raws li cov pa phem, cuam tshuam rau pob tshab.
D. Acrylate: nws yog copolymer uas muaj phenylethyl acrylate thiab phenylethyl methacrylic acid.Nws muaj tib yam kho qhov muag thiab cov yam ntxwv lom neeg xws li PMMA, tab sis kuj muaj softness.Lub refractive index yog 1.51, lub lens intraocular yog nyias, thiab folded intraocular lens tuaj yeem nthuav muag muag thiab maj mam.
Post lub sij hawm: Aug-26-2022
