Njengoko sikhula, ilensi, inkqubo yokugxila kwamehlo ethu, iqala ukuqina kancinci kancinci ize ilahlekelwe bubuthambile bayo, kwaye amandla ayo okulungisa aqala ukuba buthathaka kancinci kancinci, nto leyo ekhokelela kwisimo esiqhelekileyo somzimba: i-presbyopia. Ukuba indawo ekufutshane ingaphezulu kweesentimitha ezingama-30, kwaye izinto azibonakali ngokucacileyo ngaphakathi kweesentimitha ezingama-30, kwaye kufuneka usondeze ngakumbi ukuze ubone ngokucacileyo, kuya kufuneka ucinge ngokunxiba iiglasi ze-presbyopic.
Ngeli xesha sifunda ngeeglasi ze-multifocal eziqhubekekayo kwi-presbyopia optics. Xa i-presbyopia isenzeka, kuyadinisa ukubona, kuba iliso lomntu likwimeko yokuphumla xa ejonge kude, kwaye kufuneka i-macro-focus xa ejonge kufutshane. Nangona kunjalo, amandla okulungisa ilensi ye-presbyopic abuthathaka, kwaye ingqwalasela ayinamandla ngokwaneleyo xa ejonge kufutshane, nto leyo eya kwandisa umthwalo emehlweni. , iimpawu ezinje ngokuba buhlungu kwamehlo, ukubona okufipheleyo, kunye nentloko ebuhlungu ziimpawu eziqhelekileyo.
Umgaqo weelensi ze-multifocal eziqhubekayo
Umgaqo woyilo lweelensi ezininzi kukudala iindawo ezininzi eziqhubekekayo zokugxila kude, phakathi nakufutshane nelensi enye. Ngokuqhelekileyo, inxalenye ephezulu yelensi inamandla okujika kude, inxalenye esezantsi inamandla okujika kude, kwaye inxalenye ephakathi yelensi yindawo ye-gradient edlula kancinci amandla okujika. Iziko elikufutshane lelensi ezininzi ze-multifocal liyi-10-16 mm ngaphantsi kweziko elikude lelensi kunye ne-2-2.5 mm ngempumlo. Kufuneka kuqatshelwe ukuba kukho iindawo eziguquguqukayo kumacala omabini endawo eqhubekekayo. Xa umgca wokubona usiya kule ndawo, into ebonakalayo iya kukhubazeka, nto leyo eyenza kube nzima kwaye kungakhululeki ukuyibona.
Indlela yokusebenzisa iilensi ze-progressive multifocal
Iilensi ezine-progressive multifocal ziyandisa kancinci kancinci amandla ukusuka phezulu ukuya ezantsi, kwaye zibonelela ngeendawo ezintathu ezifihlakeleyo zelensi ezine-progressive, ezigubungela umbono okude, ophakathi, nokufutshane, ziveza ngokucacileyo umbono kumgama owahlukeneyo. Xa unxiba iiglasi ezine-progressive multifocal okokuqala, indawo yokubona kumacala omabini eelensi isenokugobeka kwaye iphazanyiswe. Xa indawo yesakhelo ishukuma okanye igobeka, inokubangela ukungakhululeki kunye nombono ofipheleyo. Landela amanyathelo "okuthula kuqala uze uhambe, kuqala ngaphakathi uze emva koko ngaphandle" ukuze uziqhelise kancinci kancinci kwaye uziqhelanise.
01. Indawo yelensi yeTelephoto
Xa uqhuba okanye ujonge, gcina isilevu sakho singene ngaphakathi kancinci, gcina intloko yakho ithe tye, kwaye ujonge embindini welensi phezulu kancinci.
02. Indawo yelensi yomgama ophakathi
Xa uqhuba okanye ujonge, gcina isilevu sakho singaphakathi kancinci, gcina intloko yakho ithe tye, kwaye ujonge embindini welensi phezulu kancinci. Ungayishukumisa intamo yakho phezulu nasezantsi kancinci de umfanekiso ucace.
03. Indawo yelensi ekufutshane
Xa ufunda incwadi okanye iphephandaba, yibeke ngqo phambi kwakho, yolula isilevu sakho phambili kancinci, uze ulungise amehlo akho ezantsi kwindawo efanelekileyo yesipili.
04. Indawo yesipili esifipheleyo
Kukho iindawo kumacala omabini elensi apho ukukhanya kutshintsha khona, kwaye indawo yokubona iya kuba luzizi. Oku kuqhelekile.
05. Iingcebiso:
Ukunyuka nokuhla kwezinyuko: Yehlisa intloko yakho kancinci uze ujonge ezantsi, kwaye ulungise indlela obona ngayo ukusuka kwindawo ekufutshane nesipili ukuya kwindawo ephakathi okanye ende yesipili.
Ukuhamba ngeenyawo imihla ngemihla: Ukuba kunzima ukugxila, zama ukujonga imitha enye ngaphambili ukuze ulungise ukugxila. Nceda uthobe intloko yakho kancinci xa ujonge kufutshane.
Ukuqhuba okanye ukusebenzisa oomatshini: Ukuba ufuna ukujonga ukusuka kude ukuya kufutshane, emacaleni okanye kwiikona ezahlukeneyo ngelixa usebenza, nceda wenze njalo kuphela emva kokuba sele uqhelene ngokupheleleyo neelensi eziqhubekekayo.
Ixesha lokuthumela: Disemba-01-2023