Into ebalulekileyo ekufuneka uyiqwalasele xa ukhetha iilensi zizinto zelensi.
Iplastiki kunye ne-polycarbonate zizinto eziqhelekileyo zeelensi ezisetyenziswa kwiiglasi zamehlo.
Iplastiki ilula kwaye ihlala ixesha elide kodwa ityebile.
I-Polycarbonate incinci kwaye ikhusela i-UV kodwa ikrwela lula kwaye ibiza kakhulu kuneplastiki.
Ilensi nganye ineempawu ezikhethekileyo ezenza ukuba ifaneleke ngakumbi kumaqela athile eminyaka, iimfuno kunye neendlela zokuphila. Xa ukhetha lensi, kubalulekile ukuqwalasela oku kulandelayo:
●Ubunzima
●Ukumelana nefuthe
●Ukumelana nokukrwela
●Ubukhulu
●Ukhuseleko lwe-Ultraviolet (UV)
●Ixabiso
Isishwankathelo seelensi zeplastiki
Iilensi zeplastiki zikwabizwa ngokuba yi-CR-39. Le nto isetyenziswa kakhulu kwiiglasi zamehlo ukusukela ngeminyaka yoo-1970 kwaye iselukhetho oludumileyo phakathi kwabantu abanxiba iiglasi ezibhalwe ngugqirha ngenxayayoixabiso eliphantsi kunye nokuqina. Ukwaleka okungenakukrweleka, umbala okhanyayo kunye nokukhusela i-ultraviolet (UV) kunokongezwa lula kwezi lensi.
●Ilula –Xa kuthelekiswa neglasi eqaqambileyo, iplastiki ilula. Iiglasi ezineelensi zeplastiki zikhululekile ukuzinxiba ixesha elide.
●Ukukhanya okuhle kokukhanya –Iilensi zeplastiki zibonelela ngokukhanya okuhle kokukhanya. Azibangeli ukuphazamiseka okukhulu kokubona.
●Ihlala ixesha elide –Iilensi zeplastiki azinakwenzeka ukuba ziqhekeke okanye ziqhekeke njengeglasi. Oku kwenza ukuba zibe lukhetho olufanelekileyo kubantu abakhutheleyo, nangona zingenakoyiswa njengepolycarbonate.
●Ixabiso eliphantsi –Iilensi zeplastiki zihlala zibiza kancinci kunee-polycarbonate.
●Ukhuseleko oluncinci lwe-UV –Iplastiki inika ukhuseleko oluncinci kuphela kwimitha ye-UV eyingozi. Ugqubuthelo lwe-UV kufuneka longezwe ukuze lukhuseleke ngokupheleleyo ukuba uceba ukunxiba iiglasi ngaphandle.
Isishwankathelo seelensi ze-polycarbonate
I-Polycarbonate luhlobo lweplastiki enganyangekiyo kakhulu esetyenziswa kakhulu kwiingubo zamehlo. Iilensi zokuqala ze-polycarbonate zorhwebo zaziswa ngeminyaka yoo-1980, kwaye zakhawuleza zathandwa.
Le lensi inamandla okuchasana nokuchaphazeleka ngokuphindwe kalishumi kuneplastiki. Ngenxa yesi sizathu, idla ngokucetyiswa kubantwana nakubantu abadala abasebenzayo.
●Ihlala ixesha elide –I-Polycarbonate yenye yezona zinto ziqinileyo nezikhuselekileyo ezisetyenziswa namhlanje kwiiglasi. Ihlala icetyiswa kubantwana abancinci, abantu abadala abakhutheleyo, kunye nabantu abafuna izibuko zokhuseleko.
●Ibhityile kwaye ilula –Iilensi zePolycarbonate zincinci ukuya kuthi ga kwi-25% kuneplastiki yesiqhelo.
●Ukhuseleko olupheleleyo lwe-UV –I-Polycarbonate ithintela imisebe ye-UV, ngoko ke akukho mfuneko yokongeza i-UV coating kwiiglasi zakho. Ezi lensi zilungile kubantu abachitha ixesha elininzi ngaphandle.
●Kucetyiswa ukuba uboya obungakrweliyo busetyenziswe –Nangona i-polycarbonate ihlala ixesha elide, le nto isanokukrweleka. Kucetyiswa ukuba kusetyenziswe uboya obungakrwelekiyo ukunceda ezi lensi zihlale ixesha elide.
●Kucetyiswa ukuba kugqunywe ulwelo oluchasene nokukhanya –Abanye abantu abaneengcebiso eziphezulu babona ukukhanya okungaphezulu kunye nombala ojikelezayo xa benxibe iilensi ze-polycarbonate. Kucetyiswa ukuba kusetyenziswe i-anti-reflective coating ukunciphisa le mpembelelo.
●Umbono ogqwethekileyo –I-Polycarbonate inokubangela umbono ogqwethekileyo kwabo banemiyalelo enamandla.
●Ebiza kakhulu -Iilensi zePolycarbonate zihlala zibiza ngaphezulu kuneelensi zeplastiki.
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