I- lens yocingo iyisilungiso esilula, isiqholo noma imithi ejwayele ukufakwa ngqo kwi-cornea yeso. Amalensi oxhumana nawo anenzuzo eminingi yabathwali, kubandakanya ukubukeka nokusebenza. Abantu abaningi bakhetha ukugqoka amalensi okuxhumana ngokungafani nezibuko zama-Eye njengoba bengasondeli, banikeza insimu ebanzi yombono, futhi bafaneleke kakhulu emisebenzini eminingi yemidlalo.
Ama-lens oxhumana nawo ahlukahluka ngokusho kwezinto zokwakha, isikhathi sokugqoka, isimiso sokushintsha, nokuklanywa. E-United States, amalensi oxhumana nabo abhekwa njengamadivaysi asezokwelapha futhi adinga ukugonywa ngumhlinzeki wezokwelapha oqeqeshiwe.
Ama-Design Lens Designs kuqala
Nakuba sicabanga ngamalensi okuxhumana njengezakhi zanamuhla, lo mqondo waqala ukuthuthukiswa nguLeonardo da Vinci. Eminyakeni engamakhulu amahlanu edlule, wathola imidwebo ebonisa ukuthi amandla okubheka iso angashintsha kanjani ngokuxhumana ngqo namanzi. Eminyakeni eminingi kamuva, abakhiqizi bacabanga ukubeka ingilazi emehlweni ukuze bashintshe indlela iso lethu eligxila ngayo. Imicabango yabo cishe yayiyobe ithuthukisiwe kakhulu uma beba nezinto zokwakha kanye nezindlela zokukhiqiza ezitholakalayo kubo namuhla. Cishe eminyakeni engaba ngu-120 edlule ososayensi baseJalimane benza i-lens yokuqala yokuxhumana ngaphandle kwesibuko. Babizwa ngokuthi ama-scellal lens ngenxa yokuthi abazange bahlale e-cornea, isakhiwo esicacile se-dome-like on the front of the eye, kodwa kunalokho wonke umhlophe omhlophe (sclera) weso.
Ama-Lens Rigid
Cishe ngo-1940, kwakhiwa i-lens yokuqala yepulasitiki ehlala kuphela e-cornea. Le plastiki yenziwa nge-PMMA (i-polymethyl methacrylate.) Ngenxa yokuthi i-lens yayincane kakhulu, kubonakala sengathi ikhululekile. Le lens ayizange ivumele umoya-mpilo ukuba udlule futhi futhi emotweni ka-1970 ayimigomo ye-permeable yenzelwe ukuxazulula le nkinga.
Lokhu kwakubonisa ukuklama kwe-PMMA lens kodwa kwakuyimpilo enhle njengoba kuvumela ukugeleza kwezinye izinyembezi nokudluliselwa kwe-oxygen.
Ama-Lens wokuxhumana aphansi
Futhi ngawo-1970, abathuthukisi babezama izinto eziplastiki ezibizwa ngokuthi i-HEMA (i-hydroxyethyl methacrylate.) Lezi zinto zazithola amanzi futhi ziguquguquka ngakho zingadlulisa phezu kwe-cornea. Ngenxa yokuthi ipulasitiki ihambisana nokuma kweso futhi yayithambile kakhulu, ama-HEMA lens anikeze induduzo ngokushesha. Lawa ma-lens ayeklanyelwe ukuba kube nhlangothi zombili ukuhlala unyaka. Ngenxa yalokho, imboni ye-lens yokuxhumana yaqhubekela phambili ngezinga eliphezulu lejubane.
AmaLensi okuxhumana alahlekile
Ngasekupheleni kwawo-1980 nakwekuqala kwawo-1990, ama-lenses atholakalayo atholakale emakethe okwenza kube lula futhi kube lula ngabantu ukuba bagqoke amalensi okuxhumana. Lezi lens zenzelwe ukugqoka kuze kube amasonto amabili, inyanga eyodwa, noma enye ikota kuye ngokuthi uhlobo lens design. Ngokushesha ngemva kwalokho, kukhishwa izilensi ezilahla nsuku zonke. Amalensi ahlaselwe nsuku zonke agqokelwe usuku olulodwa bese ephonswa kude.
Ama-Lens Amacici
Eminyakeni yamuva, ukugxila kuye kwaphenduka iplastiki esekelwe e-silicone evumela oksijini okuningi ukuba lugeleze epulasitiki ukuya e-cornea. Futhi, abakhiqizi baqhubeka nokusebenza kanzima ekwakheni ipulasitiki eyayiyinkimbinkimbi "futhi ayimile ngemuva kwamahora wokugqoka.
Ama-Lens Scleral
Ngokuthakazelisayo, ama-lens ase- scleral ayaziwa kakhulu. Ngenxa yokuthi izindlela zokukhiqiza zanamuhla zisekwa yi-computer design, ama-lens amancane angakhiwa ukuze akhululeke kahle. Ama-lenses ase-scleral asetshenziselwa abantu abanesiso esinzima kakhulu, ama-astigmatism amaningi, nabantu abane-corneal deformity and degeneration.
Futhi eyaziwa ngokuthi: Oxhumana nabo