Iilensi ze-Spectacle zilungisa iimpazamo ze-refracting ngokugoba (i-refracting) ukukhanya njengoko idlula kwi-lens. Ubungakanani bobuchule bokugoba ukukhanya (amandla elensi) obufunekayo ukuze ubone kakuhle bubonakaliswe kumyalelo womboniso onikwe ngugqirha wakho wamehlo.
Iimpazamo zokujonga kunye namandla e-lens afunekayo ukuwalungisa alinganiswa ngeeyunithi ezibizwa ngokuba yi-dioptres (D). Ukuba unengqondo ephangaleleyo, umyalelo wakho welensi unokuthi -2.00 D. Ukuba unemyopic ephezulu, inokuthi -8.00 D.
Ukuba ubona ixesha elide, udinga iilensi "plus" (+), ezityebileyo embindini kwaye zincinci emphethweni.
Iiglasi eziqhelekileyo okanye iilensi zeplastiki kwizixa eziphezulu zokungaboni ngasonye okanye ukubona ixesha elide kunokuba nzima kwaye zinzima.
Ngethamsanqa, abavelisi baye benza izinto ezahlukeneyo zeplastiki "zesalathisi esiphezulu" esigoba ukukhanya ngokufanelekileyo.
Oku kuthetha ukuba izinto ezincinci zingasetyenziswa kwilensi yesalathisi esiphezulu ukulungisa umlinganiselo ofanayo wephutha le-refractive, elenza iilensi zeplastiki ezinesalathisi esiphezulu zibe zincinci kwaye zilula kuneglasi eziqhelekileyo okanye iilensi zeplastiki.
Izibonelelo zeelensi eziphezulu zesalathisi
Thinner
Ngenxa yokukwazi ukugoba ukukhanya ngokufanelekileyo, iilensi ezinesalathiso esiphakamileyo zokungaboni ngasonye zinemiphetho ecekethekileyo kuneelensi ezinegunya elifanayo lomyalelo owenziwe ngezinto eziqhelekileyo zeplastiki.
Ikhaphukhaphu
Amaphethelo amancinci afuna izinto ezincinci zelensi, ezinciphisa ubunzima obupheleleyo beelensi. Iilensi ezenziwe ngeplastiki yesalathiso esiphakamileyo zikhaphukhaphu kuneelensi ezifanayo ezenziwe ngeplastiki yesiqhelo, ngoko ke zikhululekile ukunxiba.
Kwaye uninzi lweelensi zesalathiso esiphakamileyo zikwanalo uyilo lwe-aspheric, olubanika iprofayile enciphileyo, enomtsalane ngakumbi kwaye inciphisa inkangeleko eyandisiweyo ebangelwa ziilensi eziqhelekileyo kwimigqaliselo eyomeleleyo yokubona ixesha elide.
Ukhetho oluphezulu lwelensi
Iilensi zeplastiki eziphakamileyo eziphezulu ngoku zifumaneka kwiindidi ezahlukeneyo ze-refractive indices, ngokuqhelekileyo ukusuka kwi-1.60 ukuya kwi-1.74. Iilensi ezinesalathiso sokuphinda sibe yi-1.60 kunye ne-1.67 ubuncinane zingama-20 eepesenti ezibhityileyo kuneelensi zeplastiki eziqhelekileyo, kwaye i-1.71 okanye ngaphezulu inokuba malunga ne-50 yepesenti encinci.
Kwakhona, xa sithetha ngokubanzi, okukhona isalathisi siphezulu, kokukhona ixabiso lelensi liphezulu.
Umyalelo wakho wokubukela kwakhona umisela ukuba luhlobo luni lwemathiriyeli yesalathiso esiphezulu onokuthi uyifune kwilensi yakho. Izinto zesalathisi eziphezulu zisetyenziselwa ngokuyinhloko kwimimiselo enamandla kakhulu.
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