Ilensi yeBifocal
Ungazixelela njani ukuba ufuna iiBifocals
I-Presbyopia yimeko enxulumene neminyaka ekhokelela ekungaboni kakuhle. Idla ngokuvela ngokuthe ngcembe; uya kusokola ukubona incwadi okanye iphephandaba kufutshane kwaye uya kulisusa ngokwemvelo kude nobuso bakho ukuze libonakale ngokucacileyo.
Kwiminyaka engama-40 ubudala, i-crystalline lens ngaphakathi kwamehlo ilahlekelwa ukuguquguquka kwayo. Xa iselula, le lensi ithambile kwaye ibhetyebhetye, itshintsha ngokulula imilo ukuze ikwazi ukujolisa ukukhanya kwiretina. Emva kweminyaka engama-40, i-lens iba ngqongqo ngakumbi, kwaye ayikwazi ukutshintsha imilo ngokulula. Oku kwenza kube nzima ukufunda okanye ukwenza eminye imisebenzi esondeleyo.
IiLensi zeBifocal
Iilensi ze-Bifocal eyeglass ziqulathe amandla eelensi ezimbini ukukunceda ubone izinto kuyo yonke imigama emva kokuba uphulukene namandla okutshintsha ngokwendalo ukugxila kwamehlo akho ngenxa yobudala, ekwabizwa ngokuba yi-presbyopia. Ngenxa yalo msebenzi ukhethekileyo, iilensi ze-bifocal zidla ngokumiselwa kubantu abangaphezulu kweminyaka engama-40 ukunceda ukubuyisela ukuthotywa kwendalo kombono ngenxa yenkqubo yokuguga.
Uyilo oluNtathu lweeLensi zeBifocal
Nokuba sithini na isizathu sokuba ufuna ummiselo wokulungiswa kombono okufutshane, ii-bifocals zonke zisebenza ngendlela efanayo. Inxalenye encinci kwindawo engezantsi yelensi iqulethe amandla afunekayo ukulungisa umbono wakho okufutshane. Ilensi eseleyo iqhelekile yeyombono wakho womgama. Icandelo le-lens elinikelwe kulungiso olusondeleyo-umbono unokuba neemilo ezintathu:
Imilo yoku-1
I-Flat Top ithathwa njengenye yeelensi ezininzi ezilula ukuziqhelanisa nazo, kungoko iyeyona isetyenziswa kakhulu kwi-bifocal (FT 28mm kubhekiswa kuyo njengobungakanani obuqhelekileyo). Esi sitayile selensi sesinye sezona zifumaneka lula phantse kuyo nayiphi na indawo ephakathi kwaye kubandakanya neelensi zokuthuthuzela. I-Flat Top isebenzisa ububanzi obupheleleyo becandelo inika umsebenzisi ukufunda okuqinisekileyo kunye nokutshintsha komgama.
Imilo yesi-2
Njengoko igama libonisa ukuba i-bifocal engqukuva ingqukuva ezantsi. Ekuqaleni zazenzelwe ukunceda abanxibi ukuba bafikelele kwindawo yokufunda ngokulula ngakumbi. Nangona kunjalo, oku kunciphisa ububanzi bombono osondeleyo okhoyo phezulu kwecandelo. Ngenxa yoko, i-bifocals ejikelezayo ayithandwa kakhulu kune-flat-top bifocals.Icandelo lokufunda lixhaphake kakhulu kwi-28mm.
Imilo yesi-3: Ixutywe
Ububanzi becandelo le-Blended bifocal yi-28mm. Olu yilo lwelensi luyiyoci-osmetically eyona lens ikhangeleka kakuhle yazo zonke ii-bifocals, ebonisa phantse akukho phawu lwecandelo. Nangona kunjalo, kukho i-1 ukuya kwi-2mm yokudibanisa uluhlu phakathi kwamandla ecandelo kunye nomyalelo we-lens. Olu luhlu lokuxuba lunombono ogqwethekileyo onokuthi ubonakalise ukungaguquki kwezinye izigulane. Nangona kunjalo, ikwayi-lens esetyenziswa kunye nezigulane ezingaguqukiyo kwiilensi eziqhubekayo.
