A bifocal inonzi lens ine mafungiro maviri, kazhinji koni imwe yekuona zvinhu zviri kure, uye lensi imwe yekuona zvinhu zvakapfigwa. A bifocal inozivikanwa se-multi-focal lens. Ben Franklin anozivikanwa semuumbi weiyo yenhengo yekutanga ye-bifocal.
Chikonzero Nei Unogona Kuda Bifocal
Presbyopia: Zvakaoma kuti uzvinzwisise kusvikira iwe uchizosvika panguva iyoyo muupenyu hwako, asi pazera remakore makumi mana, tinokudziridza presbyopia .
Presbyopia inokonzera kuderera zvishoma nezvishoma mukukwanisa kuisa pfungwa pazvinhu zviri pedyo uye kuverenga kudhindwa kuduku. Pakutanga, vanhu vanoona kuoma kuverenga munzvimbo dzakasviba uye kuverenga kukosha kwekurapa bhapa remishonga. Vanhu vane presbyopia vanocherechedza zvakare kuti zvakaoma kutarisa kubva kure kusvika pedyo. Sezvo nguva yakawanda inofamba uye iyo inoswedera pedyo nekusvika makore 42 kusvika ku45, inotanga kuva nyaya yakanyanya kukura muhupenyu hwavo nezvose zvavanoedza kuverenga kana kutarisa mumusana wepedyo zvinova zvakaoma zvikuru. Vanachiremba havanyatsonzwisisi nzira iyo asi vanotenda kuti presbyopia inokura nekuda kwekubatanidza musumbu (ciliary body) mukati maziso kusashanda pamwe chete uye lens iri mukati memaziso edu, kuwedzera uye kusagadzikana. Zvose zvinokonzerwa nekushaikwa kwekwaniso yekuisa pfungwa pazvinhu zviri pedyo. Mhinduro kumatambudziko aya ndeyekuti optometrist yako inoratidze bunduki. Panguva ino, tinoda chikamu chimwe chema-lens kuti tifunge kure uye imwe chikamu chekutarisa pedyo.
Kusagadzikana kwekugara: Vamwe vanhu vanoda bifocal ndeyekugara kwekushaya basa . Vamwe vana vanoita mamiriro ezvinhu apo havagone kutarisa nyore nyore kubva kure kusvika pedyo. Vanonzwawo kuneta kukuru pavanenge vachiedza kuchengetedza pfungwa pavanenge vachiverenga kana kudzidza mukirasi.
Esotropia yekugara: Chimwe chikonzero nei vamwe vana vachifanira kupfeka bifocal ndeyechiitiko chinonzi pokugara esotropia. Ikushongedzerwa kwesotropia ndeimwe yenzira dzakajairika dzekushungurudza. Kazhinji, vana ava vanoona zvakanyanya. Ava vana vane esotropia kana ziso rakadarika rinokonzerwa nekutarisa kwemaziso sezvo vachiedza kujekesa nekubhadhara kuona. Vane kukanganisa pakati peziso reziso rekushandura system uye kuisa pfungwa. A bifocal kazhinji inoderedza dambudziko zvachose.
Mhando dzeBifocal Lenses
Bifocal lenses inowanikwa mumhando dzakasiyana-siyana.
- Flat-top - A flat flat bifocal ine chikamu chiduku chakaumbwa sehafu yenguva kana tsamba "D" kune rumwe rutivi. Iyo yakagadzirirwa pasi uye pasi ichidzika pasi pe lens. Zvichienderana nezvinodiwa, murwere angasarudza pakati pe 25mm segment kana 28 mm segment. Nzvimbo yepamusoro yekamu ine mutsara unooneka mumutambo.
- Kurara seg - Chidimbu chinoputika chikamu che 22 kana 24 mm chikamu chakatarisana nechepasi pe lens. Izvi zvakagadzirwa kuti zvibvumire munhu anonayo kuti asvike nzvimbo yekuverenga yezvikamu zvishoma zvishoma. Pakati pezvikamu hazviwanzopfeke nhasi.
- Akabatanidzwa - zvibatanidza zvakasanganiswa zvaizivikanwa zvisati zvasati zvasimbiswa. Izvo zvinowanzogadzirwa nechepakati pepamativi apo makona akabatanidzwa pamwe nezvose zvinonzi lens. Kunyange zvazvo muongorori wemapurisa akadzidziswa anogona kuhuona nyore nyore, kune dzimwe nyika yose zvishoma zvishoma kuonekwa sepamusoro-soro bifocal.
- Mutungamiri - An executive bifocal inonzi line bifocal uko hafu yepamusoro (kureba) chikamu chemukoko inoparadzaniswa zvachose kubva pachikamu chepasi (pedo) chikamu che lens ine lens inoratidzika inoenderera mberi iyo yose kumativi ose. Idzi dzaive dzakakurumbira nevanhu vaiita basa rakawandisa uye dafura basa rekuita basa ravo uye vaifungidzirwa kuvapa imwe nzvimbo yekutarisa. Ivo vakave vasingafariri mumakore achangopfuura nekuda kweshoko risingaoneki rinoenda nenzira yose mhiri kwerima. Uyewo, optical professionals akaziva kuti vanhu vangave vasina kushandisa vazhinji vemazimbe munzvimbo yemazuva akawanda sekufungidzira kumwe uye gorofa-top bifocal yakaitwa saizvozvo.
- Kufambira mberi - Kufambira mberi kwemazimbe ndeyemwenje yaunogona kunzwa inoparidzirwa sekusingaoneki, kusina kana kusina-line bifocal. Kufambira mberi kwemajeri kunowedzera kuwedzera kana kuchinja mune simba rekuverenga sezvo lenzi inopfuurira pasi kumucheto kwejeri pasina michina inooneka. Panzvimbo yekuva nemafungiro akajeka kubva kure kusvika pedo, pane kuchinja zvishoma nezvishoma musimba. Progressive lens nekuti inokurumidza kukurumidza nokuti inopa maitiro echiduku.