Iilensi eziqhubela phambili zokubona ngaphezulu kwama-40
Emva kweminyaka engama-40, akukho mntu uthanda ukuthengisa iminyaka yakhe-ngakumbi xa uqala ukuba neengxaki zokufunda ushicilelo oluhle.

Okuvuyisayo kukuba, iilensi zeglasi yamehlo eziqhubela phambili zenza ukuba kube nzima kwabanye ukuba bakuxelele ukuba ufikelele “kwiminyaka engama-bifocal.”

Iilensi eziqhubela phambili - ngamanye amaxesha zibizwa ngokuba yi "no-line bifocals" - zikunika ukubonakala kolutsha ngokususa imigca ebonakalayo efumaneka kwiilensi ze-bifocal (kunye ne-trifocal).

Izinto eziluncedo kwiilensi eziqhubekayo ngaphezu kwee-bifocals
Iilensi zeglasi yamehlo e-Bifocal zinamandla amabini kuphela: elinye kukubona kwigumbi liphela kunye nelinye kukubona kufutshane.Izinto eziphakathi, njengescreen sekhompyuter okanye izinto ezikwishelufu yegrosari, zihlala zimfiliba ngee-bifocals.

Ukuzama ukubona izinto ezikolu luhlu “luphakathi” ngokucacileyo, abanxibi be-bifocal kufuneka babambe iintloko zabo phezulu naphantsi, ngokutshintshanayo bajonge phezulu kunye nomzantsi we-bifocals zabo, ukufumanisa ukuba yeyiphi indawo yelensi esebenza ngcono.

Iilensi eziqhubela phambili zilinganisa ngokusondeleyo umbono wendalo owawuwonwabela phambi kokuqala kwe-presbyopia.Endaweni yokubonelela nje ngamagunya eelensi amabini afana nee-bifocals (okanye ezintathu, njenge-trifocals), iilensi eziqhubela phambili ziyinyani “i-multifocal” iilensi ezibonelela ngenkqubela egudileyo, engenamthungo yamandla amaninzi elens ukuze kubonwe ngokucacileyo kwigumbi, kufutshane kwaye kuyo yonke imigama phakathi.

Ngeelensi eziqhubela phambili, akukho mfuneko yokuba uphakamise intloko yakho phezulu nasezantsi okanye uthabathe iimo ezingathandekiyo ukuze ubone isikrini sekhompyuter yakho okanye ezinye izinto ezikubude bengalo.

Umbono wendalo ngaphandle "kokuxhuma umfanekiso"
Imigca ebonakalayo kwi-bifocals kunye ne-trifocals ngamanqaku apho kukho utshintsho olukhawulezayo kumandla e-lens.

Xa umgca wokujonga we-bifocal okanye we-trifocal unqumla kule migca, imifanekiso iyashukuma ngequbuliso, okanye “xhuma”.Ukungonwabi okubangelwa koku “tsiba komfanekiso” kunokususela ekubeni kukucaphukisa kancinci ukuya ekudaleni isicaphucaphu.

Iilensi eziqhubela phambili zinenkqubela phambili egudileyo, engenamthungo yamandla elensi yokubona ngokucacileyo kuyo yonke imigama.Iilensi eziqhubela phambili zibonelela ngobunzulu bendalo bokugxila ngaphandle "kokutsiba umfanekiso."

Iilensi eziqhubela phambili ziye zaba zezona zidumileyo iilensi ezininzi kuye nabani na one-presbyopia onxiba iindondo zamehlo, ngenxa yeenzuzo zabo zokubonwayo kunye nezokuthambisa ngaphezulu kwe-bifocals kunye ne-trifocals.