Ungakhathazeki — oko akuthethi ukuba kufuneka unxibe ii-bifocals okanye ii-trifocals ezingathandekiyo. Kubantu abaninzi, iilensi eziqhubekekayo ezingenamigca ziyindlela engcono kakhulu.
Zithini iilensi eziqhubekekayo?
Iilensi eziqhubekekayo ziilensi zeglasi zamehlo ezingenamgca ezininzi ezibonakala zifana nqwa neelensi zombono omnye. Ngamanye amazwi, iilensi eziqhubekekayo ziya kukunceda ubone ngokucacileyo kuyo yonke imigama ngaphandle kwezo "migca ye-bifocal" zicaphukisayo (nezichaza ubudala) ezibonakalayo kwiilensi ze-bifocal eziqhelekileyo kunye nee-trifocal.
Amandla eelensi eziqhubekekayo atshintsha kancinci kancinci ukusuka kwenye indawo ukuya kwenye kumphezulu weelensi, nto leyo enika amandla afanelekileyo elensi okubona izinto ngokucacileyo phantse kuyo nayiphi na indawo.
Kwelinye icala, iiBifocal zinamandla amabini kuphela elensi — elinye lokubona izinto ezikude ngokucacileyo kunye nelinye kwisiqingatha esisezantsi selensi sokubona ngokucacileyo kumgama othile wokufunda. Ukudibana phakathi kwezi ndawo zamandla zahlukeneyo kuchazwa "ngumgca we-bifocal" obonakalayo onqumla embindini walensi.
Iilensi eziqhubekekayo, ngamanye amaxesha zibizwa ngokuba "zii-bifocals ezingenamgca" kuba azinalo olu mgca we-bifocal obonakalayo. Kodwa iilensi eziqhubekekayo zinoyilo oluphambili kakhulu lwe-multifocal kunee-bifocals okanye ii-trifocals.
Iilensi ze-progressive ze-premium, zihlala zibonelela ngentuthuzelo kunye nokusebenza okungcono, kodwa kukho nezinye iimpawu ezininzi kunye nemisebenzi eyongezelelweyo, njengelensi ye-photochromic progressive, ilensi ye-bluecut progressive njalo njalo, kunye nezixhobo ezahlukeneyo. Ungazifumana ezifanelekileyo kwiphepha lethu.https://www.universeoptical.com/progressive-lenses-product/.
Uninzi lwabantu luqala ukudinga iiglasi zamehlo ezine-multifocal emva kweminyaka engama-40. Kulapho utshintsho oluqhelekileyo lokwaluphala kweliso olubizwa ngokuba yi-presbyopia lunciphisa amandla ethu okubona ngokucacileyo kufutshane. Kuye nabani na one-presbyopia, iilensi eziqhubekekayo zinezibonelelo ezibonakalayo nezibonakalayo xa kuthelekiswa nee-bifocals kunye nee-trifocals zemveli.
Uyilo lwe-multifocal lweelensi eziqhubekekayo lubonelela ngezibonelelo ezibalulekileyo ezilandelayo:
Inika umbono ocacileyo kuyo yonke imigama (kunokuba ibe yimigama emibini okanye emithathu eyahlukileyo yokubukela).
Iyasusa "ukutsiba komfanekiso" okukhathazayo okubangelwa zii-bifocals kunye nee-trifocals. Kulapho izinto zitshintsha khona ngequbuliso ngendlela ecacileyo kunye nendawo ebonakalayo xa amehlo akho ehamba kwimigca ebonakalayo kwezi lensi.
Ngenxa yokuba akukho "migca ye-bifocal" ebonakalayo kwiilensi eziqhubekekayo, ikunika inkangeleko yobutsha ngaphezu kwee-bifocals okanye ii-trifocals. (Esi sizathu sodwa sisenokuba yimbangela yokuba abantu abaninzi namhlanje banxibe iilensi eziqhubekekayo kunenani labanxiba ii-bifocal kunye nee-trifocals zidibene.)