Abanye besetyhini bakholelwa ukuba iiglasi zibi ngokubonakala kwazo, zithathele iilensi. Kodwa akulula ukwenza, abantu abaninzi bacinga ukuba bangakhetha njani iilensi zokunxibelelana ezifanelekileyo. Emva kwakho konke, kufuneka uqikelele into eninzi - ukusuka kwiingqinisiso ezikhethiweyo. Ukongeza, ukutyelela kwi-ophthalmologist kuyimfuneko. Iinkcukacha ezongezelelweyo malunga nenkqubo yokukhetha iilensi zoqhagamshelwano, siza kuxubusha ngaphezulu.
Yintoni okuyimfuneko ukuqala?
Ukukhetha iilensi yinkqubo eyinkimbinkimbi, ngoko kufuneka ulandele imithetho ethile eya kusindisa emva koko iingxaki zempilo. Okokuqala, kubalulekile ukuqala ngokutyelela kwi-ophthalmologist. Kuyinto enqwenelekayo ukuba ukubonisana kwenzeke kwiofisi yokuxilongwa kwekhompyutha. Izixhobo zanamhlanje zinokuchaneka ngokuchanekileyo ukuba zeziphi iilensi ozifunayo. Kubandakanywa, izixhobo eziyimfuneko ziyakwazi ukulinganisa i-cornea ukucacisa ububanzi be-lens efanelekileyo. Le nombolo iyahluka ukusuka kwi-13 ukuya kwi-15 mm. Ukongezelela, kubalulekile ukuba ufunde iikhathalogu ngeelensi zabakhiqizi abahlukeneyo, apho kungekuphela nje inkcazo epheleleyo yomkhiqizo, kodwa kunye nomyalelo wokunyamekela .
Emva kokuba ukhangela iilwimi ezikhethiweyo, khetha ezo zinto zininzi zihambelana neengcebiso zogqirha. Qaphela kwakhona intlawulo. Umlinganiselo ochanekileyo wentengo-mgangatho uvela kwiilensi ngexabiso elingaphezu komyinge, kuba liphezulu, kwaye akudingeki uhlawule ngaphezulu.
Iindidi zamalensi
Ngaphambi kokuba uqale ufunde iilensi zabakhiqizi abahlukeneyo, kukufanelekile ukwazi ukuba yeyiphi iindidi ezazisasazwa iilensi zokudibanisa, kwaye ziphi na izinto ezingcono ukhetho, uya kunceda ukucacisa ukuba ufumanisa. Okokuqala, zonke iilensi zihlukaniswe ngamaqela amathathu:
- i-astigmatism yokulungisa
- spherical - ukulungisa i-myopia;
- i-bifocal - ukulungisa ubude.
Kufuneka kuthathelwe ingqalelo ukuba bahlulwe ngokwahlukileyo:
- ithambileyo;
- ziqinile.
Ukunyaniseka kwe-lens kuxhomekeke kwizinto ezivela kuzo. Iilensi eziphantsi zihlukaniswe zibe:
- i-hydrogel;
- i-silicone-hydrogel.
Iyokuqala ilula kakhulu, kuba igobolondo yabo iqukethe kuphela i-gel, kwaye ngaphakathi kukho amanzi. Iilensi ezinamandla zenzelwe ukulungisa i-astigmatism ephezulu kwaye zenziwe nge-thermoplastiki ne-silicone. Ngaphakathi, nazo ziqulethe amanzi, kodwa inani lalo alikho ngaphezu kwama-50%.
Iilensi zinokuba nobude obude bokugqoka - ukususela ngomhla o-1 ukuya kwinyanga. Ngamanye amaxesha kuba yinto ebalulekileyo. Ngoko, ii-lens ezigqobileyo zingasetyenziswa ukususela ngeveki ukuya kwinyanga. Kodwa loo lens, alas, ayifaneleki wonke umntu, ngoko qaphela. Iinguqu ezigqoke iilensi zingagqalwa ngaphandle kokususa enye okanye ezimbini iintsuku. Iilensi zemihla ngemihla, zinokugqithiswa kungekho ngaphezu kwelanga elilodwa.
Ukuba nomdla kwindlela yokukhetha iilensi zokunxibelelana ezifanelekileyo, kuya kubakho ukufumanisa ukuba bahluke ngokwezinga le-hydrophilicity (ipesenteji yomxholo wamanzi). Encinci
Indlela yokukhetha iilensi zokudibanisa ezinemibala?
Ukukhethwa kwimibala yeelensi kunzima nakakhulu. Ugqirha-ophthalmologist kufuneka ukuba anikezele ngokubhekiselele ekukhethweni kwamalensi ebala . Kodwa ngaphambi kokuba, kufuneka aqikelele i-centering, value dioptric value kwaye ukhethe i-radius of curvature. Ukwazi iziphumo zale milinganiselo kunye nokuphulaphula iingcebiso zogqirha, uyazi ukuba ungakhetha njani iilensi zokunxibelelana ezifanelekileyo. Sikucebisa ukuba uqaphele iimveliso ezivela kubakhi abaziwayo, njengoko banikezela inkcazelo echanekileyo yemveliso yabo. Ngaloo ndlela, unethuba elincinane lokwenza iimpazamo. Ukongezelela, iimpawu ezaziwa kakuhle zibeka umgangatho wemveliso yazo, njengoko zisoyika ukulahlekelwa yintlonelo yabathengi kunye nabakhuphiswano.