Koma kupatula kukhala lenzi yokhala ndi malo ambiri opanda mizere yooneka, ma lenzi opita patsogolo amathandiza anthu omwe ali ndi vuto la presbyopia kuti azitha kuwona bwino patali.
Ubwino wa ma lens opita patsogolo kuposa ma bifocal
Magalasi a bifocal ali ndi mphamvu ziwiri zokha: imodzi yowonera m'chipinda chonse ndi ina yowonera pafupi. Zinthu zomwe zili pakati, monga chophimba cha kompyuta kapena zinthu zomwe zili pashelefu ya sitolo yogulitsira zakudya, nthawi zambiri zimakhala zosawoneka bwino ndi bifocal.
Kuti ayesere kuona zinthu zomwe zili pa "pakati" apa bwino, ovala ma bifocal ayenera kukweza mitu yawo mmwamba ndi pansi, akuyang'ana mosinthasintha pamwamba kenako pansi pa ma bifocal awo, kuti adziwe gawo liti la lens lomwe limagwira ntchito bwino.
Magalasi opita patsogolo amatsanzira kwambiri masomphenya achilengedwe omwe munkasangalala nawo musanayambe presbyopia. M'malo mongopereka mphamvu ziwiri za lens monga bifocals (kapena zitatu, monga trifocals), magalasi opita patsogolo ndi magalasi enieni a "multifocal" omwe amapereka kupita patsogolo kosalala komanso kosasunthika kwa mphamvu zambiri za lens kuti muwone bwino mchipindamo, pafupi komanso patali pakati.
Masomphenya achilengedwe opanda "kudumpha kwa chithunzi"
Mizere yooneka mu bifocals ndi trifocals ndi malo omwe pamakhala mwadzidzidzi. Komanso, chifukwa cha kuchuluka kochepa kwa mphamvu za lens mu bifocals ndi trifocals, kuya kwa kuyang'ana kwanu ndi magalasi awa n'kochepa. Kuti muwone bwino, zinthu ziyenera kukhala mkati mwa mtunda winawake. Zinthu zomwe zili kunja kwa mtunda wophimbidwa ndi mphamvu za bifocal kapena trifocal lens zidzasokonekera ndipo mphamvu ya lens idzasintha.
Koma magalasi opita patsogolo ali ndi mphamvu yoyenda bwino komanso yopanda mavuto ya ma lens kuti azitha kuona bwino patali kulikonse. Ma lens opita patsogolo amapereka kuzama kwachilengedwe popanda "kudumphadumpha kwa chithunzi."
Mphamvu ya ma lens opita patsogolo imasintha pang'onopang'ono kuchokera pamalo ena kupita pamalo ena pamwamba pa lens, zomwe zimapangitsa kuti lens ikhale ndi mphamvu yoyenera yowonera zinthu bwino patali kulikonse.
Imapereka masomphenya omveka bwino pa mtunda uliwonse (osati pa mtunda wokha wowonera kawiri kapena katatu).
Kuti muwone bwino, mukhale omasuka komanso owoneka bwino, mutha kusankha njira zazikulu kuti muzitha kusintha mosavuta komanso mwachangu kuposa ma lens opita patsogolo a m'badwo wapitawu. Mutha kulowa patsamba lino.https://www.universeoptical.com/wideview-product/kuti muwone zambiri zokhudza mapangidwe athu aposachedwa kwambiri.