Umkhwa we-presbyopia uya kubonakala ngokuthe ngcembe emva kweminyaka engama-40, kodwa kwiminyaka yakutshanje, ngenxa yemikhwa yamehlo engalunganga yabantu banamhlanje, abantu abaninzi baye babika kwangaphambili.Ke ngoko, imfuno yeiifocalskwayeabanenkqubelaiye yanda.Yeyiphi kwezi lens zimbini eyona ikhethwa kakhulu kubantu abane-myopia kunye ne-presbyopia?
1. Bifocals
I-Bifocals inedigri ezimbini.Ngokuqhelekileyo, inxalenye ephezulu isetyenziselwa ukubona iindawo ezikude, ezifana nokuqhuba nokuhamba;inxalenye engezantsi isetyenziselwa ukubona kufuphi, njengokufunda incwadi, ukudlala ngefowuni ephathwayo, njl. Xa iilensi ze-bifocal zaphuma kuqala, ngokwenene zazigqalwa njengeendaba ezilungileyo kubantu abanombono omfutshane kunye ne-presbyopia, ukuphelisa inkathazo yokususwa rhoqo kunye nokunxiba, kodwa njengoko abantu bazisebenzisayo, bafumanisa ukuba iilensi ze-bifocal nazo zineengxaki ezininzi.
Okokuqala, eyona nto ingathandekiyo yolu hlobo lweelensi kukuba kukho idigri ezimbini kuphela, kwaye akukho tshintsho olugudileyo phakathi kokujonga kude nakufuphi, ngoko kulula ukuvelisa i-prism phenomenon, ebizwa ngokuba yi "jump image".Kwaye kulula ukuwa xa uyigqobile, engakhuselekanga kangako kubathwali, ngakumbi abantu abadala.
Okwesibini, enye into engalunganga ecacileyo yeelensi ze-bifocal kukuba ukuba ujonga ngononophelo iilensi ze-bifocal, unokubona umgca ocacileyo wokwahlula phakathi kweedigri ezimbini kwilensi.Ngoko ngokubhekiselele kwi-aesthetics, isenokungabi ntle kakhulu.Ngokubhekiselele kubumfihlo, ngenxa yeempawu ezicacileyo zeelensi ze-bifocal, kunokuba nzima kubathwali abancinci.
Iilensi ze-Bifocal ziphelisa ingxaki yokususwa rhoqo kunye nokunxiba i-myopia kunye ne-presbyopia.Bayakwazi ukubona ngokucacileyo kumgama nakufutshane, kwaye ixabiso lincinci;kodwa indawo yomgama ophakathi inokuba luzizi, kwaye ukhuseleko kunye ne-aesthetics ayilungile.
2. Abaqhubela phambili
Iilensi eziqhubela phambili zineendawo ekugxilwe kuzo ezininzi, ngoko ke njengeelensi ze-bifocal, zifanelekile kubantu abanombono omfutshane kunye ne-presbyopia.Indawo engasentla yelensi isetyenziselwa ukubona umgama, kwaye esezantsi isetyenziselwa ukubona kufutshane.Kodwa ngokungafaniyo neelensi ze-bifocal, kukho indawo yotshintsho ("indawo eqhubekayo") embindini welensi eqhubekayo, esivumela indawo yesidanga esiguqukayo ukuze sibone umgama ukusuka kude ukuya kufutshane.Ukongeza phezulu, phakathi, kunye nezantsi, kukho indawo eyimfama kumacala omabini e-lens.Le ndawo ayikwazi ukubona izinto, kodwa incinci, ngoko ke ayichaphazeli ukusetyenziswa.
Ngokubhekiselele kwimbonakalo, iilensi eziqhubekayo zingabonakali kwiiglasi zombono omnye, kwaye umgca wokwahlula awuyi kubonwa lula, kuba kuphela umntu onxibe iilensi eziqhubekayo unokuziva umehluko kumandla kwiindawo ezahlukeneyo.Kufanelekile ngakumbi kwabo bafuna ukukhusela ubumfihlo babo.Ngokumalunga nokusebenza, inokuhlangabezana neemfuno zokubona kude, phakathi nakufutshane.Kukhululekile ngakumbi ukujonga umgama ophakathi, kukho indawo yokutshintsha, kwaye umbono uya kucaca ngakumbi, ngoko ke ngokwefuthe lokusetyenziswa, i-progressives ingcono kune-bifocals.
Ixesha lokuposa: Jun-30-2023