Akukho maxhala - oko akuthethi ukuba kufuneka unxibe i-bifocals engathandekiyo okanye i-trifocals.Kubantu abaninzi, iilensi eziqhubelekayo ezingenamgca zilukhetho olungcono kakhulu.
Ziziphi iilensi eziqhubekayo?
Iilensi eziqhubela phambili ziilensi zeglasi zamehlo ezingenamgca ezininzi ezijongeka ngokufanayo neelensi zombono omnye.Ngamanye amazwi, iilensi eziqhubekayo ziya kukunceda ubone ngokucacileyo kuyo yonke imigama ngaphandle kwezo zicaphukisayo (kunye nokuchaza iminyaka) "imigca ye-bifocal" ebonakala kwii-bifocals eziqhelekileyo kunye ne-trifocals.
Amandla eelensi eziqhubekayo atshintsha ngokuthe ngcembe ukusuka kwindawo ukuya kwelinye kumphezulu welensi, ebonelela ngamandla achanekileyo elens okubona izinto ngokucacileyo nakuwuphi na umgama.
I-Bifocals, kwelinye icala, inamandla amabini kuphela e-lens-enye yokubona izinto ezikude ngokucacileyo kunye namandla esibini kwisiqingatha esisezantsi selensi yokubona ngokucacileyo kumgama ocacileyo wokufunda.Ukudibana phakathi kwezi zowuni zamandla ezahlukeneyo ngokwahlukileyo kuchazwa "ngumgca we-bifocal" obonakalayo onqumla kumbindi welensi.
Iilensi eziqhubela phambili, ngamanye amaxesha zibizwa ngokuba yi "no-line bifocals" kuba azinawo lo mgca we-bifocal ubonakalayo.Kodwa iilensi eziqhubela phambili zinoyilo oluphezulu kakhulu lwe-multifocal kune-bifocals okanye i-trifocals.
Iilensi ezihamba phambili zePremium, zihlala zibonelela ngeyona nto ingcono kunye nokusebenza, kodwa kukho ezinye iibrendi ezininzi kunye nemisebenzi eyongezelelweyo ngokunjalo, njenge-photochromic progressive lens, ibluecut progressive lens njalo njalo, kunye nezinto ezahlukeneyo.Unokufumana okufanelekileyo kuwe kwiphepha lethuhttps://www.universeoptical.com/progressive-lenses-product/.
Uninzi lwabantu luqala ukufuna iiglasi zamehlo ezininzi emva kweminyaka engama-40 ubudala.Nabani na one-presbyopia, iilensi eziqhubekayo zineenzuzo ezibonakalayo ezibonakalayo kunye nezithambiso xa kuthelekiswa ne-bifocals yemveli kunye ne-trifocals.
Uyilo oluninzi lweelensi eziqhubekayo lubonelela ngezantsi kweenzuzo ezibalulekileyo:
Inika umbono ocacileyo kuyo yonke imigama (kunokuba imigama nje emibini okanye emithathu eyahlukileyo).
Iphelisa "ukutsiba komfanekiso" okukhathazayo okubangelwa yi-bifocals kunye ne-trifocals.Apha kulapho izinto zitshintsha ngesiquphe ekucaceni nakwindawo ebonakalayo xa amehlo akho eshukuma kwimigca ebonakalayo kwezi lens.
Ngenxa yokuba akukho "imigca ye-bifocal" ebonakalayo kwiilensi eziqhubekayo, zikunika inkangeleko yolutsha ngakumbi kune-bifocals okanye i-trifocals.(Esi sizathu sisodwa sinokuba kutheni abantu abaninzi namhlanje benxiba iilensi eziqhubekayo kunenani labanxiba i-bifocal kunye ne-trifocals zidityanisiwe.)