Uphephile Kunamafonti Asheshayo Ovamile?
Izigidi zabantu zijabulela i-lens yokuxhumana enempilo nsuku zonke. Noma kunjalo, ama-lens axhumene nawo ayingozi. Obuhlungu, izifo zesohlo ezibuhlungu zibangele ukulahlekelwa kombono noma ukuphuphuthekisa. Nakuba imvamisa yalezi zifo isincane, okwenzekayo kusabalulekile ngokwanele ukuba odokotela baxwayise iziguli zezingozi ezihambisana nokugqoka kwendwangu yokuxhumana, futhi batusa imikhiqizo ethile engase izuze iziguli zabo.
Ngenxa yezingozi ezihlobene nokugqoka kwendwangu yokuxhumana, ukucwaninga kwamalensi okuxhumana nokuthuthukiswa kugxile esikhathini esidlule ekukhiqizeni amalensi avumela amazinga aphezulu oksijini ukuba adlule kuwo. Abacwaningi bacabanga ukuthi uma kungadalwa izinto ezizovumela ukuthi oksijini okwanele ifike ku- cornea uma kuqhathaniswa nokungagqoki noma yiluphi i-lens, lezi zifo ezibuhlungu nezinye izibhamu ezihlobene nocingo zinganciphisa noma ziqedwe ngokuphelele.
I-Oxygen Deprivation Syndrome
Cishe ngo-1995, ama-lens aphezulu e-oksijeni axhumene ne-silicone aphinde athulwe emphakathini. Lawa lens amasha avumela izikhathi ezingamatshumi ayisikhombisa inani le-oksijeni njengama-lens wamanje ukuze adlulisele ku-cornea neleso, ngisho nangesikhathi sokulala.
Ngakho-ke, siphi manje? Ingabe lezi zensimbi eziphezulu ze-oksijeni zasiza ekuqedeni izinkinga? Impendulo ingubobo no-cha. Amalensi e-allicin ahlinzeka ngemvelo enempilo yeso lonke.
Iziguli eziningi ezigqoke ngokweqile ama-lens alo oxhumana nawo atholakalayo avame ukuthuthukisa "i-oxygen deprivation syndrome." I-oxygen deprivation syndrome yigama elihlanganiswe imboni yokunakekelwa kwamehlo ukumela iziguli ezingenaso isifo, kodwa zivuvukale emacneas zazo futhi zenze i-neovascularization, noma "ukukhula komkhumbi wegazi" emehlweni abo.
Lezi zimfutho ezingavamile zegazi zizama ukondla i-oxygen ku-cornea ngokusebenzisa ukugeleza kwegazi esikhundleni sokuvela emkhathini lapho i-cornea evame ukuthola i-oxygen yayo. Lezi ziguli zivame ukuba namahlo abomvu futhi umbono wabo uguquke kakhulu ngenxa yokuvuvukala. Ngenxa yalokho, kunzima kakhulu kudokotela wezilanga ukuhlola umbono wabo ngesikhathi sokuhlolwa kweso . Kodwa-ke, lapho odokotela bebafaka kabusha kwelinye lamalensi amasha ase-silicone, cishe emlenzeni, eziningi zazo lezo zimpawu noma izimpawu zixazulula ngokushesha.
Ucwaningo alubonisi ingozi yokutheleleka ekutheleleni
Kuthiwani ngokutheleleka? Ingabe lawa lensi aqeda ukutheleleka? Ucwaningo lwamuva luqedile ngabacwaningi base-Australia nabakwa-United Kingdom ukuthola ukuthi amasha lensimbi e-hydrogel lens anganciphisa ingozi yokutheleleka ngenxa yokuthuthukiswa kwe-oxygen. Lezi zifundo zavuma ukuthi amacilisi amacilisi awazange anciphise ingozi ye- bacterial keratitis kulabo abathintekayo be-lens. Ucwaningo lwamanje lubheke kulokho odokotela abakwelashwa abaye bazizwa iminyaka eminingi: Izifo ezithinta i-lens zingabangelwa yizici ngaphandle kwe-oksijeni, njenge-stagnation yezinyembezi zezinyembezi, izinguquko ebusweni be-cornea, kanye nokwenyuka okuncane kwezingqamuzana ze-corneal ezibangelwa ukuthinta i-lens yokugqoka.
Kubalulekile ukuqonda ukuthi ukudluliselwa kwe-oksijeni kuseyingxenye enkulu, kodwa kungenzeka ukuthi akuyona into kuphela eyenza ukutheleleka.
Enye ingozi yengozi ivela cishe cishe yonke inhlolovo ephethwe keratitis ehlobene ne-lens ... elele kuma-lens wokuxhumana . I-single, enkulu kunazo zonke engozini yokulahleka kombono ngokugcwele igqoke amalensi ebusuku. Ingozi yakho yokuthuthukisa ukutheleleka iphindwe kabili uma ulala ngamalensi okuxhumana. Ezinye izici ezingozini zokuthuthukisa ukutheleleka kwesifo esibucayi zihlanganisa ukubhema, ukuthenga amalensi nge-intanethi , isimo sephansi sezenhlalo nezomnotho, ukuhlanza okungalungile , ukugqoka isikhathi, nokukhula.
Ucwaningo lwe-UK lithole ukuthi izingozi zahluka ngokuphawuleka kakhulu kuye ngokuthi uhlobo lens lens contact. Kulolu cwaningo, abacwaningi babheka ukuthi ukusetshenziswa okungavamile, amalensi othintana nosuku nsuku zonke kunesilinganiso esincane sokutheleleka kunamaviki amabili noma ama-lens atholakalayo njalo ngenyanga. Ngokuthakazelisayo, abathwali be-lens abalahla nsuku zonke babe nenengozi engaphezu kwezikhathi ezingu-1.5 zokukhula keratitis. Kodwa-ke, uhlobo lwamagciwane noma "bug" lwaluyinto encane kakhulu. Ngamanye amazwi, izidalwa ezibangele ukutheleleka kulabo abathwala izilonda zansuku zonke abangekho amathuba okubangela ukulahlekelwa kombono omkhulu. Eqinisweni, abathwali abathintekayo nsuku zonke babephelile imiphumela yemibono engaphezu kuka-20/40.
Ama-brand we-silicone hydrogel lens atholakalayo, ngokulandelana kwe-oksijeni yokudluliselwa komzimba okuphansi kakhulu:
- I-Air Optix Night & Day ngo-Alcon
- I-Air Optix Aqua yi-Alcon (ithuthukisa induduzo kubantu abagqoka amalensi nsuku zonke)
- I-Biofinity EW nge-Coopervision
- I-Acuvue Oasys yi-Vistakon (eyenzelwe ukuthi ibe nemanzi amaningi kunamanye, inenzuzo kubantu abanamehlo asomile)
- I-Ultra nge-Bausch ne-Lomb
Kukhona futhi i-torc (i-astigmatism yokulungisa) i-silicone i-hydrogel lens emakethe:
- PureVision 2 Toric nguBausch noLomb
- I-Air Optix Aqua ye-Astigmatism ngu-Alcon
- I-Biofinity Toric nge-Coopervision
Yize lezi zilensi zincane kakhulu kunezenzi zendabuko, zinikeza izinzuzo ezengeziwe kubathwali.
Ngakho-ke ukuphikisana kuyaqhubeka: Kungcono yini ukusebenzisa kabusha i-lens okumelwe ikhunjulwe futhi igcinwe ezimweni ezingase zingcolile eziphethe amabhaktheriya noma ukulahla ilensi nsuku zonke? Indlela yokuphila yomuntu wonke, i-biochemistry kanye ne-physiology ihluke, ngakho-ke lokho okusebenza ngesiguli esisodwa kungase kungasebenzi kulo olandelayo. Buza uchwepheshe wakho wokunakekela iso ukuze uthole iseluleko.
Umthombo: Sindt, Christine W., OD Abicacel Hydrogel Ukuxhumana Amalensi. Ukubuyekezwa kwe-Optometry, Septemba 2007.