1.59 PC Polycarbonate Bifocal Lens
Ziziphi iilensi zePolycarbonate?
Iilensi zePolycarbonate zohlulwe ngokomelela kwazo, ukuqhekeka, kunye neempawu ezikwaziyo ukumelana nokukrweleka. Ukumelana nempembelelo kubenza bahluke kwezinye iilensi zeglasi yamehlo. Oku kubenza babe lolona khetho lufanelekileyo kubantu abaphila ubomi obusebenzayo abathanda ukuwisa okanye ukukrwela iindondo zabo. Iilensi zePolycarbonate nazo zifanelekile kwiimpahla zamehlo zabantwana kunye neeglasi zokhuseleko ezichazwe ngugqirha.
Ikhaphukhaphu kwaye ibhityile kuneplastiki eqhelekileyo okanye iilensi zeglasi, iilensi zepolycarbonate zinokukhululeka ngakumbi ukunxitywa kwaye aziwuncami umgangatho. Azongezi ukutyeba ekuboneni kakuhle, zinciphisa ukugqwetheka, yaye zithintela i-100 ekhulwini lemitha yelanga eyingozi yeultraviolet (Ukukhanya kweUV).
Iiglasi ezineelensi zepolycarbonate zaqala ukwenziwa ngoo-1980, kwaye beziphucuka ukusukela ngoko. Zonke iilensi eziqhelekileyo, ezifana ne-anti-reflective coating, i-reflective-resistant-resistant coating, kunye ne-tints zingasetyenziswa kwezi lens.
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 ingqukuvaemazantsi. Ekuqaleni zazenzelwe ukunceda abanxibi ukuba bafikelele kwindawo yokufunda ngokulula ngakumbi. Nangona kunjalo, oku kunciphisa ububanzi bombono osondeleyo okhoyo phezulu kwecandelo. Ngenxa yoku, ii-bifocals ezijikelezayo azithandwa kakhulu kunezobifocals flat-top.Icandelo lokufunda lidla ngokufumaneka 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.
