Osadandaula - izi sizikutanthauza kuti muyenera kuvala ma bifocals osasangalatsa kapena ma trifocal. Kwa anthu ambiri, magalasi opita patsogolo opanda mzere ndi njira yabwinoko.
Kodi magalasi opita patsogolo ndi chiyani?
Magalasi opita patsogolo ndi magalasi agalasi opanda mizere ambiri omwe amafanana ndendende ndi magalasi amaso amodzi. Mwa kuyankhula kwina, magalasi opita patsogolo adzakuthandizani kuwona bwino pamtunda uliwonse popanda "mizere ya bifocal" yokhumudwitsa (komanso zaka) yomwe imawonekera mu bifocals ndi trifocals wamba.
Mphamvu ya magalasi opita patsogolo imasintha pang'onopang'ono kuchokera ku mfundo kupita kumalo a lens pamwamba, kupereka mphamvu yolondola ya lens yowona zinthu momveka bwino pamtunda uliwonse.
Mbali inayi, ma bifocals ali ndi mphamvu ziwiri zokha za lens - imodzi yowonera zinthu zakutali bwino ndi mphamvu yachiwiri m'munsi mwa lens kuti muwone bwino pamtunda wowerengera. Kulumikizana pakati pa magawo amphamvu awa kumatanthauzidwa ndi "mzere wa bifocal" wowonekera womwe umadutsa pakati pa mandala.
Magalasi opita patsogolo, nthawi zina amatchedwa "no-line bifocals" chifukwa alibe mzere wowoneka bwino. Koma magalasi opita patsogolo amakhala ndi mapangidwe apamwamba kwambiri kuposa ma bifocals kapena trifocals.
Magalasi opitilira patsogolo, nthawi zambiri amapereka chitonthozo ndi magwiridwe antchito abwino, koma palinso mitundu ina yambiri ndi ntchito zinanso, monga magalasi opita patsogolo a photochromic, lens ya bluecut progressive ndi zina zotero, ndi zipangizo zosiyanasiyana. Mutha kupeza yoyenera nokha patsamba lathuhttps://www.universeoptical.com/progressive-lenses-product/.
Anthu ambiri amayamba kufunikira magalasi a maso nthawi zambiri atatha zaka 40. Apa ndi pamene kusintha kwa ukalamba kwa diso kotchedwa presbyopia kumachepetsa mphamvu yathu yowona bwino pafupi. Kwa aliyense amene ali ndi presbyopia, magalasi opita patsogolo amakhala ndi zopindulitsa zowoneka bwino komanso zodzikongoletsera poyerekeza ndi ma bifocals achikhalidwe ndi trifocals.
Mapangidwe a multifocal a magalasi opita patsogolo amapereka maubwino otsatirawa:
Imawonetsetsa bwino pamipata yonse (osati pamipata iwiri kapena itatu yosiyana yowonera).
Imathetsa "kudumpha kwazithunzi" kovutitsa komwe kumachitika chifukwa cha ma bifocals ndi trifocals. Apa ndi pamene zinthu zimasintha mwadzidzidzi momveka bwino komanso powonekera pamene maso anu akuyenda kudutsa mizere yowonekera mu magalasi awa.
Chifukwa palibe "mizere ya bifocal" yowoneka m'magalasi opita patsogolo, imakupatsani mawonekedwe achinyamata kuposa ma bifocals kapena trifocals. (Chifukwa chake chokha chingakhale chifukwa chake anthu ambiri masiku ano amavala magalasi opita patsogolo kuposa omwe amavala ma bifocal ndi trifocal pamodzi.)