Xa abantu abaneminyaka engama-40 okanye kunjalo, amehlo ethu aba bhetyebhetye. Kuba nzima ngathi ukulungelelanisa phakathi kwezinto ezikude kunye nezinto ezivalayo, njengaphakathi kokuqhuba nokufunda imisebenzi. Kwaye le ngxaki yamehlo ibizwa ngokuba yi-presbyopia.
Iilensi zombono omnye zisetyenziselwa ukulola ugxininiso lwakho lwemifanekiso ekufutshane okanye ekude. Nangona kunjalo, azinakusetyenziselwa ukulola umbono wakho kuzo zombini. Iilensi zeBifocal ziphucula umbono wakho wemifanekiso ekufutshane nekude.
Iilensi zeBifocal zinemiyalelo emibini. Inxalenye encinci kwindawo engezantsi yelensi iqulethe amandla okulungisa umbono wakho okufutshane. Ilensi eseleyo iqhelekile yeyombono wakho womgama.
Iilensi ze-photochromic bifocal ziba mnyama njengeglasi yelanga xa uphuma phandle. Zikhusela amehlo akho ekukhanyeni okuqaqambileyo kunye nemitha ye-UV, ekuvumela ukuba ufunde kwaye ujonge ngokucacileyo ngaxeshanye. Iilensi ziya kucaca kwakhona ngaphakathi ngaphakathi kwimizuzu nje embalwa. Unokuyonwabela ngokulula imisebenzi yangaphakathi ngaphandle kokuyikhupha.
Njengoko usazi ukuba i-bifocals inemigqaliselo emibini kwisiqwenga esinye selensi, inxalenye ekufutshane yommiselo ibizwa ngokuba “yiSegment”. Kukho iintlobo ezintathu zee-bifocals ezisekwe kubume becandelo.
I-Photochromic flat-top bifocal lens ikwabizwa ngokuba yi-photochromic D-seg okanye i-straight-top. Ino “layini” obonakalayo kwaye eyona nto iluncedo kukuba inika amagunya amabini ahluke kakhulu. Umgca ucacile kuba utshintsho lwamagunya lukhawuleza. Ngenzuzo, ikunika eyona ndawo ibanzi yokufunda ngaphandle kokujonga kude kakhulu kwilensi.
Umgca kwi-photochromic round top awubonakali nje ngokuba kwi-flat photochromic top top. Xa igugile, ithande ukungabonakali kakhulu. Isebenza ngokufana nomphezulu weflethi yephotochromic, kodwa isigulana kufuneka sijonge ezantsi kwilensi ukuze sifumane ububanzi obufanayo ngenxa yokumila kwelensi.
I-Photochromic blended yi-design top round apho imigca yenziwe ingabonakali kakhulu ngokudibanisa imimandla eyahlukeneyo phakathi kwamagunya amabini. I-advanteji yi-cosmetic kodwa idala ukuphazamiseka okubonakalayo.