Ukulungisa ku-Presbyopia
Ama-lensi othintana nawo ayindlela enhle kakhulu kulabo abaneminyaka engaphezu kwengu-40 ubudala futhi babhekene nombono onzima. Lapho sineminyaka engama-40 ubudala, amehlo ethu aqala ukuthuthukisa i- presbyopia . I-Presbyopia yisimo lapho amehlo alahlekelwa khona ukugxila ngokucacile ezintweni eziseduze. Lesi yisikhathi lapho abantu abaningi beqala ukuthenga nxazonke ukuze bafunde izibuko . Abanye banquma ukugqoka ama-eye-glass multifocal agxile , ama-trifocal, noma ayikho.
Ukulandela kukhona okukhethwa kukho okuthintana kwamalensi kubantu abangaphezu kuka-40.
AmaLensi okuxhumana noGlasi lokuFunda
Uma ugqoka ama-lens oxhumana nabo embonweni webanga, iilazi zokufunda ezilula zingahle zishaywe ukubuka izinto eduze nokufunda. Kodwa-ke, ungase uthole kunzima ukufinyelela izibuko zakho zokufunda ngenkathi ugqoka amalensi akho oxhumana nabo. Phela, cishe ugqoke ama-lens oxhumana nabo kuqala ngoba awujabuli ukugqoka izibuko.
Lolu khetho lungase lungabonakali olukhangayo kuwe, kepha lokhu kuyindlela engcono kakhulu yokuthola umbono ocacile kude, phakathi noma eduze. Amalensi okuxhumana anqunyelwe ukulungisa ibanga lakho ngokugcwele. Khona-ke ama-eye-glass-length-eye-glass-eye-eye-vision noma eyodwa-mbono eduze kokufunda izibuko zigqokelwe izinto eziseduze.
- I-PROS: Nakuba kungenjalo indlela elula kakhulu yokulungiswa kombono, le ndlela iveza umbono ocacile, obukhali kunabo bonke umsebenzi. Abantu abanemisebenzi ethile edinga umbono oqondile ngokuvamile benza kangcono ukugqoka le ndlela yokulungiswa kombono. Abagijimi bavame ukujabulela le ndlela ukuze bandise umbono wabo kude.
- I-CONS: Kumele ugqoke futhi ususe izibuko zakho zokufunda njalo uma ufisa ukubona kahle kude. Empeleni, kufanele ube nezibuko zakho zokufunda njalo .
I-Monovision Xhumana namaLensi
Ku- monovision , i- lens eyodwa yokuxhumana igqoke umbono wesibanga futhi enye igugile eduze. I-lens yokuxhumana ibanga ngokuvamile igqoke iso elibusayo .
Sonke sinesiso esiqakathekileko esisisebenzisa ngokuyinhloko lapho sibheke kude nezinto. Ngenxa yalokho, i-lens yokuxhumana esondelene kakhulu esweni elingabonwayo ayibonakali ukudala ubunzima ekuvumelaneni nale ndlela yokulungiswa kombono .
- I-PROS: Nakuba kuzwakala kuyinqaba, iziguli eziningi zokuxhumana ze-lono zilungiselela ngokushesha kunezinye izinhlobo zama-lens okuxhumana nawo. Umbono oseduze usabonakala uqondile kancane nge-monovision ngoba iso ngalinye lilingana namandla angaboni lens. Futhi, uma kunzima kuwe ukuthola i- lens yokuxhumana ekhululekile , udokotela wakho cishe unokukhetha okungenamkhawulo wezinto zokwakheka kwe-lens, ubukhulu nobubunjwa ngoba i-monovision iwukulungiswa kwamandla nje, kunokuba kube uhlobo oluthile lwamalensi wokuxhumana .
- I-CONS: Abanye abantu baqaphela ibanga elincane noma ukushayela umbono, ikakhulu ebusuku, nge-monovision. Ukucabangela ukujula kunciphile kancane ngenkathi kugqoke i-monovision, okungaba yinkinga ebalulekile kubantu abajabulela imidlalo, njengegalufu kanye ne-tennis. Kanti futhi, abaqhubi abashayeli bezentengiselwano noma zokuzilibazisa abakwazi ukugqoka i-monovision njengoba kungabangela indawo ethile yombono ukuba ihlukane kancane.
Ama-Lens wokuxhumana we-Bifocal noma ama-Multifocal
Ama-lens oxhumana nabo ama-bifocal noma amaningi ahlose ukudala umbono obalulekile wemvelo, njengoba amehlo womabili aqondiswa umbono wesibanga kanye nombono oseduze.
Ama-lens multifocal atholakale ezinhlobonhlobo ezahlukene, kuhlanganise negesi elinamandla elimelelekayo , eliqinile eliqinile / elithambile, nama-lens okuthintana avamile. Kuye ngomkhiqizi, bonke basebenza kancane ngokuhlukile.
Amanye ama-lens aqinile aklanyelwe njenge-lined flat-top bifocal eyeglass lens futhi ujikeleze iso lakho. Uma ubheka phansi ukuze ufunde, zihamba kancane ukuze umugqa wakho wokubona uhlanganiswe nesigaba esiseduze. Amanye ama-lens abhekwa njengezinhlaka ze-aspheric futhi azivame ukuhamba eduze kweso. I-Aspheric idiza kancane kancane futhi ikhulise ngokushelela amandla kusukela phakathi kuya endaweni ehamba ngayo lens.
Amanye alawa ma-lens aseduze kwamandla embono phakathi kwe-lens namandla ebanga ku-periphery, noma ngokuphambene nalokho. Lawa amalensi oxhumana nawo asebenza kangcono njenge-lens ye-no-line esheshayo yembonakude lens futhi ngezinye izikhathi ancike ebukhulu bezingane zakho.
Amanye amalensi angase ahlelwe ngokucophelela. Imiklamo ekhonjiwe inezindandatho ezithinta ezinye ibanga futhi eduze kwamandla. Lezi zifana nokuba nama-lens amabili, ibanga elilodwa kanye nelinye elikude, liphonswe ndawonye.
Kuzothatha isikhashana ukuthi amehlo akho ahlenge ama-lens okuxhumana nawo. Ngemva kwesikhashana, amehlo akho azofunda ukuhlukanisa phakathi kwemigomo ehlukene, futhi uzoqala ukusebenzisa imithi efanele yebanga elifanele.
- I-PROS: Amalensi e-Multifocal anciphisa kancane ukuqonda okujulile, uma kunjalo. Uma kufanelekile ngempumelelo, ngeke kudingeke ugqoke izibuko ezingaphezu kwamalensi akho oxhumana nabo emisebenzini yakho eminingi yansuku zonke.
- I-CONS: Ezinye iziguli zamalensi ye-lentile zikhalaza ngombono ophukile ngenkathi zenza imisebenzi ethile. Uma umbono webanga lucacile kakhulu, ngakho-ke umbono obuseduze ngezinye izikhathi uhlupheka. Uma eduze kweso mbono kucacile, ibanga noma umbono ophakathi kungenzeka ube ngaphansi kokulindelekile. Odokotela abaningi bamehlo babuza iziguli zabo ukuthi babone ukuthi yikuphi okubaluleke kakhulu futhi okuqondene nabo futhi bahlose ukunikeza umbono ongcono walo msebenzi. Abanye abantu bakhononda ngezithombe ezifayo noma kabili kabili kwezithombe ngezikhathi ezithile, ngokuvamile uma begqoke oxhumana nabo be-multifocal okokuqala. Nakuba lokhu kuyingxenye yenqubo yokuzivumelanisa, kuphazamisa abanye abantu kuze kube lapho beyeka ukugqoka khona. Ngokungafani nokuzwela ngezinye izikhathi kuyinkinga ngenkathi igqoke ama-lens multifocal. Abanye abantu bazokwazi ukufunda umugqa we-20/20, kodwa bathi akubonakali "ku-crisp."
Okufanele Ukwazi
Abanye odokotela bamehlo bahlanganisa inhlanganisela yalezi zindlela ezingenhla, kuye ngezidingo zesiguli. Ama-lens axhumene nama-presbyopic ancike ezintweni eziningi ezihlanganisa ukuguquguquka kwakho, indlela yokuphila, imithi yokugqoka kanye nesimo somzimba nesimo somzimba wakho. Odokotela be-optometric kanye nama-ophthalmologists abanjana nama-lens oxhumana nabo ngokushesha bafunde ukuthi uhlobo lensiza eyodwa alusebenzi kuwo wonke umuntu. Amalensi okuxhumana afanelekayo okulungisa i-presbyopia adinga isayensi encane nobuciko obuncane.
Umthombo:
Gupta, N, SA Naroo noJS Wolffsohn. "Ukuqhathanisa okubonakalayo kwe-lens multi-contact e-monovision." I-Optometry ne-Visual Science, Feb 2009.