Umkhuba we-presbyopia uzovela kancane kancane ngemva kweminyaka engama-40, kodwa eminyakeni yamuva, ngenxa yemikhuba emibi yamehlo yabantu banamuhla, abantu abaningi baye babika kusengaphambili i-presbyopia.Ngakho-ke, isidingoama-bifocalsfuthiabaqhubekayoiye yanda futhi.Iyiphi kulawa malensi amabili ekhethwa kakhulu kubantu abane-myopia ne-presbyopia?
1. I-Bifocals
Ama-Bifocals aneziqu ezimbili.Ngokuvamile, ingxenye engenhla isetshenziselwa ukubona izindawo ezikude, njengokushayela nokuhamba ngezinyawo;ingxenye engezansi isetshenziselwa ukubona okuseduze, njengokufunda incwadi, ukudlala ngomakhalekhukhwini, njll. Lapho amalensi e-bifocal ephuma okokuqala, ayebhekwa njengevangeli kubantu abangaboni kahle kanye ne-presbyopia, eqeda inkathazo yokususwa njalo nokugqoka, kodwa njengoba abantu bewasebenzisa, bathola ukuthi ama-lens e-bifocal nawo anezinkinga eziningi.
Okokuqala, ubungozi obukhulu balolu hlobo lwamalensi ukuthi kukhona amadigri amabili kuphela, futhi akukho ukuguquka okushelelayo phakathi kokubheka kude naseduze, ngakho-ke kulula ukukhiqiza i-prism phenomenon, evame ukubizwa ngokuthi "isithombe se-jump".Futhi kulula ukuwa uma uyigqokile, okungaphephile kangako kwabayigqokile, ikakhulukazi asebekhulile.
Okwesibili, okunye okubi okusobala kwamalensi e-bifocal ukuthi uma ubheka ngokucophelela amalensi e-bifocal, ungabona umugqa ocacile ohlukanisayo phakathi kwamadigri amabili kulens.Ngakho-ke mayelana nobuhle, kungase kungabi kuhle kakhulu.Ngokuphathelene nobumfihlo, ngenxa yezimpawu ezicacile zamalensi e-bifocal, kungase kube nzima kubathengi abancane.
Amalensi e-Bifocal aqeda inkinga yokususwa njalo nokugqokwa kwe-myopia ne-presbyopia.Bayakwazi ukubona ngokucacile kude naseduze, futhi intengo ishibhile;kodwa indawo yebanga eliphakathi ingase ifiphele, futhi ukuphepha nobuhle abubuhle.
2. Abathuthukayo
Amalensi aqhubekayo anezindawo eziningi zokugxila, ngakho njengamalensi e-bifocal, afanele abantu abangaboni kahle kanye ne-presbyopia.Ingxenye engenhla yelensi isetshenziselwa ukubona ibanga, kanti engezansi isetshenziselwa ukubona eduze.Kodwa ngokungafani namalensi e-bifocal, kukhona indawo yoshintsho ("indawo eqhubekayo") phakathi nelensi eqhubekayo, esivumela indawo yedigri eguquguqukayo ukuze sibone ibanga ukusuka kude ukuya eduze.Ngaphezu kwaphezulu, phakathi nendawo, naphansi, kukhona nendawo eyimpumputhe ezinhlangothini zombili zelensi.Le ndawo ayikwazi ukubona izinto, kodwa incane kakhulu, ngakho-ke ayithinti ukusetshenziswa.
Ngokuqondene nokubukeka, ama-lens aqhubekayo ngokuyisisekelo awakwazi ukuhlukaniswa nezibuko zombono owodwa, futhi umugqa ohlukanisayo ngeke ubonakale kalula, ngoba kuphela ogqoke ama-lens aqhubekayo angakwazi ukuzwa umehluko emandleni ezindaweni ezahlukene.Ifaneleka kakhulu kulabo abafuna ukuvikela ubumfihlo babo.Mayelana nokusebenza, ingahlangabezana nezidingo zokubona kude, okuphakathi nendawo naseduze.Kukhululeke kakhudlwana ukubheka ibanga eliphakathi nendawo, kukhona indawo yoguquko, futhi umbono uzocaca, ngakho-ke mayelana nomphumela wokusetshenziswa, okuthuthukayo nakho kungcono kune-bifocals.
Isikhathi sokuthumela: Jun-30-2023