1. Malingana ndi malo okhazikika a lens ya intraocular m'diso, ikhoza kugawidwa m'chipinda cham'mbuyo cha intraocular lens ndi posterior chamber intraocular lens.Anterior chamber intraocular lens (IOL) nthawi zambiri amaikidwa m'chipinda cham'mbuyo chifukwa cha zovuta zambiri zapambuyo pa opaleshoni.
2.Kugawa molingana ndi zinthu za lens intraocular
A. Polymethylmethacrylate (PMMA): polymethylmethacrylate ndi zinthu zoyamba zomwe zimagwiritsidwa ntchito popanga magalasi a intraocular.Ndilo chinthu chomwe chimakondedwa pamagalasi olimba a intraocular.Imakhala ndi magwiridwe antchito okhazikika, kulemera kopepuka, kuwonekera bwino, ndipo sichingasokonezedwe ndi momwe thupi limayendera makutidwe ndi okosijeni.Refractive index ndi 1.49.Choyipa chake ndikuti sichimalimbana ndi kutentha kwakukulu komanso kupha tizilombo toyambitsa matenda.Pakalipano, mpweya wa ethylene oxide umagwiritsidwa ntchito kwambiri popha tizilombo toyambitsa matenda, ndipo kusinthasintha kwake sikuli bwino.Pali mitundu iwiri ya ntchito zachipatala: imodzi ndi intraocular lens kuponyedwa ndikukanizidwa ndi zinthu za PMMA panthawi imodzi, zomwe zimatchedwa chidutswa chimodzi;Chachiwiri, gawo la kuwala kwa lens limapangidwa ndi PMMA, ndipo chingwe chothandizira chimapangidwa ndi polypropylene, yomwe imatchedwa zidutswa zitatu.
B. Gel silicon: ndizinthu zazikulu za lens yofewa ya intraocular, yokhala ndi kukhazikika kwabwino kwa kutentha, kutentha kwapamwamba kwa disinfection, kukhazikika kwa maselo, kukana kukalamba bwino, biocompatibility yabwino, kufewa ndi kusungunuka.Itha kubzalidwa kudzera m'madula ang'onoang'ono.Refractive index idachokera ku 1.41 mpaka 1.46.The kuipa ndi osauka toughness, kusinthasintha pansi mawotchi mphamvu, zosavuta kutulutsa zotsatira electrostatic ndi zosavuta kuyamwa zinthu zachilendo.
C. Hydrogel: poly (hydroxyethyl methacrylate) ndi zinthu za hydrophilic, zomwe zili ndi madzi a 38% - 55%, mpaka 60%, kukhazikika kwabwino, biocompatibility yabwino, kukana kutentha kwakukulu ndi kulimba kwakukulu.Magalasi a intraocular amatha kutaya madzi ndikuyikidwa.Pambuyo pobwezeretsa madzi m'thupi, kufewa kwake kumabwezeretsedwa ndipo kutalika kwake kwa mzere kumawonjezeka ndi 15%.Chifukwa ndi wolemera mu madzi permeability, intraocular metabolites akhoza kulowa mkati ndi kumamatira kuipitsa, kukhudza kuwonekera.
D. Acrylate: ndi copolymer yopangidwa ndi phenylethyl acrylate ndi phenylethyl methacrylic acid.Ili ndi mawonekedwe ofanana ndi mawonekedwe achilengedwe monga PMMA, komanso imakhala yofewa.Refractive index ndi 1.51, mandala a intraocular ndi ochepa, ndipo mandala opindika a intraocular amatha kukula mofewa komanso pang'onopang'ono.
Nthawi yotumiza: Aug-26-2022
