Ingabe udinga ukuthenga amalensi amaningi, kodwa umshwalense wakho wokuthintana ne-lens usuphelelwe yisikhathi? Amehlo akho angase azizwe kahle, futhi oxhumana nabo bangase babonakale besebenza kahle. Ngakho-ke, kufanele ukhokhele umuthi omusha uma umbono wakho ungashintshi? Kungani imiyalelo ye-lens yokuxhumana iphela?
Kuyiqiniso-uma isigqebhezana sakho se-lens yokuxhumana siphelelwa yisikhathi, kuzodingeka wenze i-aphoyintimenti ne- optometrist yakho ukuze uthole okubuyekeziwe.
Ngeke ukwazi ukuthenga amanye amalensi oxhumana nabo kuze kube yilapho wenza, ngisho noma uwathenga ku-intanethi . Uma umdayisi womthengisi oxhumana naye ku-intanethi uthengisa amalensi oxhumana naye ngaphandle komthetho ovumelekile, benza kanjalo ngokungemthetho futhi kunconywa ukuba uyeke ukwenza ibhizinisi nabo ukuze ugweme izinkinga zomthetho ezingenzeka.
Ama-Lens Okuxhumana nawo Alawulwa yi-FDA
Imininingwana ye-lens yokuthintana nayo iphelelwa yisikhathi ngezizathu ezifanayo ukuthi imishanguzo yezokwelapha iphelelwa yisikhathi. Noma nini lapho usebenzisa umkhiqizo wezokwelapha, kufanele ulandele udokotela wakho okungenani kanye ngonyaka ukuze ubone ukuthi kungenzeka yini izinkinga. I-FDA ibheka amadivayisi wezokwelapha zama-lens. Ngo-2004, kudluliselwa umthetho owabeka usuku lokuphelelwa yisikhathi kwemigomo yokuxhumana yelensi ngonyaka owodwa, noma ubuncane obudingwa ngumthetho wezwe, noma yikuphi okukhulu.
Amehlo akho nombono kubonakala sengathi kuphelele kepha lokho kungabi yiNdaba
Khumbula ukuthi i-lens yocingo ingumzimba wangaphandle ofakwe esweni lakho.
Ihlezi phezulu kwe- cornea -isakhiwo esicacile, esifana nesimo se-dome engxenyeni engaphambili yeso lakho. Ama-lens othintana nabo axhumane nesikhumba esingaphakathi kweso, okuthiwa i-conjunctiva, ngaphansi kwamajwabu akho. Baxhumana nabo ngezinyembezi zakho. Sinenhlanhla ukuhlala ezweni lanamuhla lapho kutholakala khona kalula idivayisi njengethuluzi lokuxhumana elithambile futhi lingakhipha umbono oseduze.
Ngezinye izikhathi sikhohlwe ukuthi i-lens yocingo ifana ne-cell ephilayo, kodwa isengxenye yeplastiki eyenziwe ngumuntu. Iphuzu eliphambili kakhulu lezingqondo zepulasitiki wena, kodwa nokho ungumzimba wangaphandle osesweni.
Ama-Lens Okuxhumana Okugqoke Ngaphezulu Angabangela Imiphumela Engemuhle
Ngenkathi i-cornea inikeza amandla amaningi e-refractive iso, lenziwe ngamaseli aphilayo, aphefumulayo. Izinqubo ze-metabolic zenzeka nsuku zonke e-cornea, njengalokhu kuwo wonke umzimba wakho. Izinto ezidakayo kanye nezinkunkuma ezivela kumaseli ase-cornea ziyadala. Lezi zinto ngezinye izikhathi zingakha ngokungadingekile ngaphansi kwe-lens yokuxhumana eqinile, okudala indawo enobuthi ye-cornea yakho.
Ama-lens angaphezu kokugqoka ama-lens angaholela ekwakheni i-lactic acid-up ngaphakathi kwe-cornea, okuholela ekuvupheni. Lapho ukuvuvukala kwenzeka, amangqamuzana ase-cornea angase asakaze ukwahlukana. Ama-bacterium kanye nama-virus angakwazi ukufaka kalula lezi zindawo ezingahle zibe khona ku-cornea, mhlawumbe ukudala ukutheleleka nokukhishwa. Ama-lens angaphezu kokugqoka ama-lens nawo angaholela ekunqotshwe oksijini; Izitsha zegazi ezintsha zizoqala ukukhula zibe yi-cornea ukuze uzame ukuyidla i-oxygen eyidinga.
Okufanele Ukwazi
Kubalulekile ukuthi ube nodokotela wezilanga okungenani ubuke i-cornea yakho kanye ngonyaka ukuze uqiniseke ukuthi ama-lens akho awabangela izinkinga nokuthi imithi yakho yesiguli inembile yezidingo zakho zamanje.
Esikhathini esilandelayo lapho uhlela ngokucophelela isheke lens contact, zikhumbuze ukuthi uvikela umbono wakho ngokulondoloza impilo yamehlo akho futhi ujabulele umbono ongcono kakhulu ongayenza.
Umthombo:
Association American Optometric. Okudingeka Ukwazi Ngolwazi Lokuxhumana Lens Uhlanzeko Nokuthobela. AOA.com, 2006-09.