Maitiro e presbyopia anozoonekwa zvishoma nezvishoma mushure memakore makumi mana, asi mumakore achangopfuura, nekuda kwemaitiro asina kunaka emeso evanhu vemazuva ano, vanhu vakawanda vane presbyopia yakashuma kare.Naizvozvo, kudiwa kwebifocalsuyevanofambira mberiyakawedzerawo.Ndeipi yemalenzi maviri aya inonyanya kufarirwa kune vanhu vane myopia uye presbyopia?
1. Bifocals
Bifocals vane madhigirii maviri.Kazhinji, chikamu chepamusoro chinoshandiswa kuona nzvimbo dziri kure, dzakadai sekutyaira uye kufamba;chikamu chezasi chinoshandiswa kuona chiri pedyo, zvakadai sekuverenga bhuku, kutamba nefoni, nezvimwewo. Kana bifocal lenses yakatanga kubuda, ivo zvechokwadi vaionekwa sevhangeri kune vanhu vane kuona kwenguva pfupi uye presbyopia, kubvisa dambudziko rekubviswa nguva dzose uye kupfeka, asi sezvo vanhu vakavashandisa, vakaona kuti bifocal lenses vanewo zvakawanda zvisingabatsiri.
Chokutanga pane zvose, kukanganisa kukuru kwemhando iyi yemalensi ndeyekuti kune madhigirii maviri chete, uye hapana shanduko yakatsetseka pakati pekutarisa kure nepedyo, saka zviri nyore kugadzira prism phenomenon, iyo inowanzonzi "jump image".Uye zviri nyore kudonha kana uchipfeka, izvo zvisinganyanyi kuchengetedzeka kune vanopfeka, kunyanya vakwegura vanopfeka.
Chechipiri, chimwe chisiri pachena chebifocal lenses ndechekuti kana iwe ukanyatsotarisa bifocal lenzi, unogona kuona mutsara wakajeka wekuparadzanisa pakati pemadhigirii maviri palenzi.Saka maererano neaesthetics, inogona kunge isiri yakanaka kwazvo.Panyaya yekuvanzika, nekuda kwehunhu huri pachena hwebifocal lenses, zvinogona kunge zvisiri nyore kune vadiki vanopfeka.
Bifocal lenses inobvisa dambudziko rekugara kubviswa uye kupfeka myopia uye presbyopia.Vanogona kuona zvakajeka vari kure uye pedyo, uye mutengo wacho wakachipa;asi nzvimbo yepakati inogona kunge yakasvibiswa, uye kuchengeteka uye aesthetics hazvina kunaka.
2. Vanofambira mberi
Malenzi anofambira mberi ane mapoinzi akawanda, saka senge bifocal lenzi, akakodzera vanhu vane kapfupi-kuona uye presbyopia.Chikamu chepamusoro chelenzi chinoshandiswa kuona chinhambwe, uye chepasi chinoshandiswa kuona pedyo.Asi kusiyana nebifocal lenzi, pane shanduko yenzvimbo ("progressive zone") iri pakati peinofambira mberi lenzi, iyo inotibvumira iyo adaptive dhigirii nzvimbo kuti tione chinhambwe kubva kure kuenda pedyo.Kuwedzera kumusoro, pakati, uye pasi, kune zvakare nzvimbo yebofu kumativi ese maviri e lens.Iyi nzvimbo haigone kuona zvinhu, asi idiki, saka haina kukanganisa kushandiswa.
Maererano nechitarisiko, ma lenzi anofambira mberi anonyanya kusiyanisa kubva kune rimwe chete magirazi ekuona, uye mutsara wekuparadzanisa hauzooneki nyore, nokuti chete anopfeka lenzi anofambira mberi anogona kunzwa mutsauko wesimba munzvimbo dzakasiyana.Inonyanya kukodzera kune avo vanoda kuchengetedza zvakavanzika zvavo.Panyaya yekushanda, inogona kusangana nezvinodiwa zvekuona kure, pakati uye pedyo.Zvinonyanya kugadzikana kutarisa chinhambwe chepakati, kune nzvimbo yekuchinja, uye chiono chichave chakajeka, saka maererano nekushandiswa kwekushandisa, zvinofambira mberi zviri nani pane bifocals.
Nguva yekutumira: Jun-30-2023