Ungakhathazeki — lokho akusho ukuthi kufanele ugqoke ama-bifocal noma ama-trifocal angathandeki. Kubantu abaningi, amalensi aqhubekayo angenawo umugqa ayindlela engcono kakhulu.
Ayini amalensi aqhubekayo?
Amalensi aqhubekayo angamalensi ezibuko zamehlo angenawo umugqa amaningi afana ncamashi namalensi ombono owodwa. Ngamanye amazwi, amalensi aqhubekayo azokusiza ukuthi ubone ngokucacile kuzo zonke izindawo ngaphandle kwalawo "migqa ye-bifocal" ecasulayo (nechaza ubudala) ebonakala kuma-bifocal avamile nama-trifocal.
Amandla amalensi aqhubekayo ashintsha kancane kancane kusukela endaweni kuya endaweni ebusweni belensi, okunikeza amandla afanele elensi okubona izinto ngokucacile cishe kunoma yiliphi ibanga.
Ngakolunye uhlangothi, ama-Bifocal anamandla amabili kuphela elensi — elilodwa lokubona izinto ezikude ngokucacile kanye namandla esibili engxenyeni engezansi yelensi okubona ngokucacile ebangeni elithile lokufunda. Ukuhlangana phakathi kwalezi zindawo zamandla ezihlukene ngokusobala kuchazwa "umugqa we-bifocal" obonakalayo onqamula phakathi kwelensi.
Amalensi aqhubekayo, ngezinye izikhathi abizwa ngokuthi “ama-bifocal angenawo umugqa” ngoba awanalo lo mugqa we-bifocal obonakalayo. Kodwa amalensi aqhubekayo anomklamo we-multifocal othuthuke kakhulu kunama-bifocal noma ama-trifocal.
Amalensi aqhubekayo aphezulu, ngokuvamile ahlinzeka ngenduduzo nokusebenza okuhle kakhulu, kodwa kunezinye izinhlobo eziningi nemisebenzi eyengeziwe, njengelensi eqhubekayo ye-photochromic, ilensi eqhubekayo ye-bluecut njalo njalo, kanye nezinto ezahlukahlukene. Ungathola efanelekile ekhasini lethu.https://www.universeoptical.com/progressive-lenses-product/.
Iningi labantu liqala ukudinga izibuko zamehlo ezibanzi ngemva kweminyaka engama-40. Yilapho ushintsho olujwayelekile lokuguga esweni olubizwa ngokuthi i-presbyopia lunciphisa ikhono lethu lokubona ngokucacile eduze. Kunoma ubani one-presbyopia, amalensi aqhubekayo anezinzuzo ezibalulekile zokubona nokuhlobisa uma kuqhathaniswa nama-bifocal nama-trifocal avamile.
Umklamo we-multifocal wamalensi aqhubekayo unikeza izinzuzo ezibalulekile ezilandelayo:
Inikeza umbono ocacile kuwo wonke amabanga (kunokuba kube amabanga amabili noma amathathu kuphela ahlukene okubuka).
Kuqeda "ukugxuma kwesithombe" okukhathazayo okubangelwa ama-bifocal nama-trifocal. Yilapho izinto zishintsha khona ngokuzumayo ngokucaca kanye nesimo esibonakalayo lapho amehlo akho ehamba emigqeni ebonakalayo kula malensi.
Ngenxa yokuthi azikho "imigqa ye-bifocal" ebonakalayo kumalensi aqhubekayo, ikunikeza ukubukeka kobusha kakhulu kune-bifocal noma i-trifocal. (Lesi sizathu sodwa singase sibe ukuthi kungani abantu abaningi namuhla begqoka amalensi aqhubekayo kunenani labagqoka i-bifocal kanye ne-trifocal zihlangene.)