1.523 Ilensi ye-Glass Bifocal Photochromic Photogrey Optical

Uma ukulungiswa kwamehlo omuntu kuba buthaka ngenxa yobudala, udinga ukulungisa umbono wakhe ngokuhlukana ukuze abone kude naseduze. Ngalesi sikhathi, ngokuvamile udinga ukugqoka amapheya amabili ezingilazi ngokwehlukana, okuyinto engathandeki kakhulu. Ngakho-ke, kuyadingeka ukuthi ugaye amandla amabili ahlukene okuphinda aqhamuke kwilensi efanayo ukuze abe amalensi ezindaweni ezimbili. Amalensi anjalo abizwa ngokuthi ama-bifocal lens noma izibuko ze-bifocal.

Uhlobo lwe-Fusion:iwukuhlanganisa impahla yelensi ngenkomba ephezulu yokuphinda iphinde iphinde ingene endaweni eyi-concave epuletini eliyinhloko ekushiseni okuphezulu, futhi inkomba ye-refractive yepuleti elikhulu iphansi. Bese ugijima ebusweni besiqephu esincane ukuze wenze ukugoba kwendawo engaphansi kwesiqephu kuhambisane nalokho kwesiqephu esikhulu. Awukho umqondo wokuklanywa. Ukufunda okwengeziwe u-A kuncike emandleni e-refractive F1 obuso obungaphambili benkundla ekude yombono, i-FC curvature ye-arc yokuqala ye-concave kanye nesilinganiso sokuhlanganisa. Isilinganiso sokuhlanganisa siwubudlelwano obusebenzayo phakathi kwenkomba yokuphinda yenzeke yezingxenye ezimbili zelensi ehlanganisayo, lapho u-n emelela inkomba ye-refractive yengilazi eyinhloko (imvamisa ingilazi yomqhele) futhi u-ns umele inkomba ye-refractive ye-sub-sheet (ingilazi ye-flint) ene inani elikhulu, bese kuba isilinganiso sokuhlanganisa k=(n-1)/(nn), ngakho A=(F1-FC)/k. Kungabonakala kufomula engenhla ukuthi ngombono, ukushintsha i-front surface curvature yepuleti elikhulu, i-concave arc curvature kanye ne-sub-plate refractive index ingashintsha idigri eyengeziwe eseduze, kodwa empeleni, ngokuvamile ifinyelelwa ngokushintsha. i-sub-plate refractive index. Ithebula 8-2 libonisa inkomba ye-refractive yengilazi ye-flint yeshidi elincane elivame ukusetshenziswa emhlabeni ukuze kwenziwe izibuko ze-bifocal ezihlanganisa eduze ezengeziwe.