Coloured lens: Ibali kokusungulwa ukukhalipha

uya Mhlawumbi abaninzi ungamangaliswa bafunde ukuba iilensi contact kusungulwe namnye ngaphandle uLeonardo da Vinci, nkqu 1508 echaza lens apho, xa zixhonywe yeso ndoda balungise umbono ngokuguqula iimpawu woqondo iso.

Kude 40 zenkulungwane lokugqibela phantse zonke iilensi eyenziwe esipilini noko zamafu, yazinyusa ubukhulu yabo 20-30 mm (kubagubungela bonke ubuso yeso). lens ayide ikwazi zinganxitywa ngaphezu kweeyure ezimbalwa, kuba ibangela ukudumba kwenwebu kunye ukungaboni, kwaye emva kokuba ilens liyasuswa iliso, yemini ngaphezu kwesinye yokubuyisela inwebu. Kakade ke, ukuze loo nto ibe lens webala, ngoxa ayaziwa nakubani na.

Ngo-1947 kwakukho contact lens uhlobo yokuqala mihla, yenziwe yeplastiki okhethekileyo, ukudalwa apho ngaphezu konyaka omnye, oosonzululwazi wasebenza.

Kwaye kuphela phakathi kwinkulungwane XX oko kwayilwa hydrogel Polymer, kwaye le mini sisiseko ezininzi izinto zale mihla zokwakha ibe selubala kunye nazo zonke iintlobo lenses elinombala. Le izinto lula kwaye athambileyo uye iimpawu ezizodwa: ezithwala ioksijini ize afunxa amanzi.

Okwangoku kukho iintlobo-150 ezahlukeneyo izinto ezilungiselelwe ukwenziwa lweentlobo ezahlukeneyo lenses, umgangatho zabo imini uphuculwe emini.

Xa imveliso izinto ezinjalo ingqalelo inqaba yabo, ipesenti umxholo amanzi, oksijini permeability, biocompatibility, isalathiso zokunganyangeki kunye nezinye iparameters.

Namhlanje, ngoncedo iintlobo ezahlukeneyo lenses ayikwazi kuphela umbono echanekileyo ngaphandle iiglasi, kwaye ukutshintsha umbala yamehlo, kwaye ngaxeshanye ukwenza zombini.

Indlela ukukhetha ilens ekunene ngaphandle kokuqhatha impilo iliso?

lenses ezinemibala diopters, kukho sele iminyaka engaphezu kwama-30. Akubalulekanga nje entle, kodwa elula kakhulu. Ukuba ekuqaleni bona ifumaneka kuphela ukuya iinkwenkwezi movie, ngoku nabani na lula ukutshintsha umbala yendalo ngamehlo xa ufuna. lens nganye iqulathe ipateni elolonga umbala okanye umbala, bakwazi ukuphucula umbala endalo iliso kwabantu zobuqu.

Noko ke, ngaphambi kokuba wenze isigqibo sokuba kuthenga iilensi ezinemibala, kufuneka babenolwazi imithetho kukhathalelo lwabo. Nayiphi lens umbala Ifuna i kuninyamekela ngenyameko yaye amanyathelo okhuseleko xa isetyenziswa lens elula okulungisa.

Ukuze imibala ilens akuthethi ukuba kabi kwi iliso, kufuneka ukusondela ngenyameko ngokukhethwa kwemveliso kunye nemveliso ononophelo.

lens nganye ezinemibala kufuneka zihlanjwe ngononophelo kwaye ucocwe. Kodwa musa ukulibala ukuba ukuze anyamekele iilensi bebala kufuna izisombululo ezikhethekileyo musa ukukrwela kwaye umonakalo ipeyinti. Ukuze ufumane inkcazelo engakumbi ngendlela yokunyamekela lens lophawu ethile, ungasoloko ufumana esaluni ngokukhanya, apho uceba ukuthenga lenses. lens ngesepha ezinemibala kunye nezisombululo eziqulathe iperoksayidi yehidrojeni - kule zibe buthuntu.

Okubaluleke kakhulu, ngaphambi kokuba uthenge lens ezinemibala, qiniseka ukuba axilongwe zamehlo. Uphando lubonisa ukuba rhoqo enxibe iilensi bebala kunganciphisa acuity ezibonwayo kunye nshita Uvakalelo esweni.