Amalensi aqhubekayo okubona ngaphezu kwama-40
Ngemva kweminyaka engu-40, akekho othanda ukukhangisa iminyaka yakhe - ikakhulukazi uma uqala ukuba nenkinga yokufunda imibhalo emihle.

Ngokujabulisayo, amalensi engilazi yamehlo aqhubekayo akwenza kube nzima ngabanye ukukutshela ukuthi usufinyelele “eminyakeni ye-bifocal.”

Amalensi aqhubekayo - ngezinye izikhathi abizwa ngokuthi "no-line bifocals" - akunikeza ukubukeka kobusha ngokususa imigqa ebonakalayo etholakala kumalensi e-bifocal (kanye ne-trifocal).

Izinzuzo zamalensi aqhubekayo ngaphezu kwama-bifocals
Amalensi e-bifocal eyeglass anamandla amabili kuphela: elokubona lonke igumbi elinye elokubona eduze.Izinto eziphakathi nendawo, njengesikrini sekhompyutha noma izinto eshalofini lesitolo segrosa, ngokuvamile zihlala zifiphele ngama-bifocal.

Ukuze uzame ukubona izinto ezikulobu bubanzi “obumaphakathi” ngokucacile, abagqoki be-bifocal kufanele banqekulise amakhanda abo phezulu naphansi, ngokushintshana babheke phezulu naphansi kwe-bifocals yabo, ukuze banqume ukuthi iyiphi ingxenye yelensi esebenza kangcono.

Amalensi aqhubekayo alingisa ngokuseduze kakhulu umbono wemvelo owujabulele ngaphambi kokuqala kwe-presbyopia.Esikhundleni sokunikeza amandla amalensi amabili nje njengama-bifocal (noma amathathu, njengama-trifocals), amalensi aqhubekayo angamalensi eqiniso “ama-multifocal” ahlinzeka ngokuqhubekayo okubushelelezi, okungenamthungo kwamandla amalensi amaningi ukuze abone kahle egumbini lonke, eduze futhi kuwo wonke amabanga phakathi.

Ngamalensi aqhubekayo, asikho isidingo sokubhekisa ikhanda lakho phezulu naphansi noma ukwamukela ukuma okungakhululekile ukuze ubone isikrini sekhompyutha yakho noma ezinye izinto ezibude bengalo.

Umbono wemvelo ongenayo "isithombe gxuma"
Imigqa ebonakalayo ku-bifocals kanye ne-trifocals ingamaphuzu lapho kukhona khona ushintsho olusheshayo emandleni amalensi.

Uma umugqa wokubona womuntu ogqokile we-bifocal noma we-trifocal uhamba unqamula le migqa, izithombe ziyanyakaza kungazelelwe, noma “gxuma”.Ukungakhululeki okubangelwa yilokhu "kugxuma kwesithombe" kungasukela ekucasuleni kancane kuye ekudaleni isicanucanu.

Amalensi aqhubekayo anokuqhubeka okubushelelezi, okungenamthungo kwamandla amalensi okubona kahle kuwo wonke amabanga.Amalensi aqhubekayo anikeza ukujula okungokwemvelo okwengeziwe ngaphandle “kokugxuma kwesithombe.”

Amalensi aqhubekayo asephenduke amalensi ezinto eziningi aziwa kakhulu kunoma ubani one-presbyopia ogqoka izibuko zamehlo, ngenxa yezinzuzo zabo zokubukwa nezimonyo ngaphezu kwama-bifocals nama-trifocals.