Pankhani ya luso la kuwala, mapangidwe a lens amagawidwa m'magulu awiri: spherical ndi aspheric.Magalasi a aspheric, motsogozedwa ndi kufunafuna kuonda, amafunikira kusintha kwa kupindika kwa mandala, kupatukana kwambiri ndi kupindika kwakale kozungulira.Mapangidwe ozungulira, omwe anali ofala m'mbuyomu, adakhudzidwa ndi kusinthika kowonjezereka ndi kupotoza.Izi nthawi zambiri zimabweretsa zovuta zodziwika bwino monga zithunzi zosawoneka bwino, kusawona bwino, komanso kusawona bwino.
Tsopano, mapangidwe a aspheric atulukira ngati mphamvu yokonza, kuthana ndi zosokoneza zowoneka bwinozi ndikupereka yankho lomwe limapereka magalasi omwe sali opepuka komanso ochepa kwambiri komanso mofanana.Chofunika kwambiri, kupititsa patsogolo uku sikusokoneza kukana kwamphamvu kwa magalasi, ndikuwonetsetsa kuti kuvala kotetezeka.
Magalasi ozungulira achikhalidwe ali ndi mbali yodziwika bwino - zinthu zomwe zimawonedwa mozungulira ma lens zimaoneka mopotoka, zomwe zimalepheretsa wovalayo kuti aziwona.M'nthawi yomwe ukadaulo umasinthika mosalekeza, magalasi a aspheric - chodabwitsa chowona - amachepetsa kutembenuka m'mphepete mwa lens, kukulitsa gawo lowonera kuti likwaniritse zomwe makasitomala amafuna.Ma lens a aspheric amakhala ndi mapindikira osalala komanso opepuka, kumapangitsa kukopa kwachilengedwe komanso kukongola.Makamaka ngati ali ndi mphamvu zowoneka bwino, amachepetsa kupotoza kwa maso, kuwapangitsa kukhala chisankho choyenera kwa ogula omwe ali ndi zofunikira zapamwamba zamankhwala.
Chodziwika bwino cha magalasi a aspheric ndi kupindika kwawo kwapadera.Mapangidwe a aspheric awa amapereka maubwino angapo kuposa magalasi achikhalidwe ozungulira:
1.Clarity: Kuchiza ndi njira yapadera yokutira, magalasi a aspheric amapereka chitsanzo chowoneka bwino, kuwonetsetsa kuti muwone bwino komanso momasuka.
2.Comfort: Choncho kuwala ndi pafupifupi imperceptible, magalasi aspheric amachepetsa 'kulemera' pa maso anu, kulola kuvala momasuka ndi khama.
3.Mawonekedwe Achilengedwe: Mapangidwe awo a aspheric amachepetsa kusokonezeka kwa mawonekedwe, zomwe zimatsogolera ku lingaliro lenileni komanso lolondola.
Poyerekeza ma lens ozungulira ndi a aspheric a zinthu zofanana ndi mankhwala, magalasi a aspheric amawoneka osalala, ocheperako, ndipo amapereka zochitika zenizeni komanso zomasuka.Kuyang'ana mawonekedwe a lens poyang'anizana ndi gwero la kuwala kumawonetsa kuti zowunikira zochokera ku magalasi ozungulira nthawi zambiri zimakhala zowongoka (kupatula magalasi amphamvu kwambiri);magalasi a aspheric, komabe, amawonetsa kupindika kwakukulu chifukwa cha kupindika kosiyanasiyana pamtunda wawo.
M'mphepete mwa magalasi ozungulira achikhalidwe amangowoneka okhuthala komanso amapotoza ndi kupotoza kawonedwe ka zinthu, chodabwitsa chomwe chimatchedwa kuti image aberration.Kuti akwaniritse mapangidwe opepuka, zida zapamwamba za refractive index zagwiritsidwa ntchito popanga mandala.Komanso, tikayang'ana ndi magalasi ozungulira, mawonekedwe a nkhope ya mwiniwake amasokonekera.Magalasi a aspheric, mosiyana, amachepetsa makulidwe onse apakati ndi m'mphepete, zomwe zimapangitsa kuti lens yocheperako yomwe imachotsa zotumphukira zotumphukira, motero imapereka mawonekedwe achilengedwe.
Magalasi a aspheric amapereka mawonekedwe otakata komanso osapindika m'mphepete, osawoneka bwino pang'ono, zomwe zimapangitsa zithunzizo kukhala zachilengedwe.Ma lens awa ndi olimba katatu kuposa ofanana nawo ozungulira, kuwapangitsa kukhala oyenera kwa achinyamata ovala.Ndi mankhwala omwewo -5.00DS, magalasi a aspheric ndi 26% opepuka kuposa magalasi ozungulira.Malo awo osalala amapangitsa kuti dziko lapansi likhale lachilengedwe, losasinthika, pafupi ndi patali, zomwe zimachepetsa kutopa kwamaso kwa nthawi yayitali.
Zoyenera kwa oyamba kuvala magalasi, makamaka ophunzira ndi ogwira ntchito muofesi, magalasi a aspheric amachepetsa kwambiri kusapeza koyambirira komwe kumakhudzana ndi kuvala magalasi.Ndiwo njira yabwino kwambiri kwa ogwiritsa ntchito ma lens olumikizirana, omwe amagwira ntchito ngati zobvala zosungira kunyumba.Magalasi a aspheric amatsanzira kwambiri masomphenya achilengedwe, monga momwe amachitira ndi ma lens.Ndiabwino kwa iwo omwe amakonda kutsitsa zomwe adalemba, akufuna kupewa kuoneka kwa maso ang'onoang'ono ndi magalasi a myopia, kufunafuna kuchepetsa kulemera kwa magalasi awo, kapena kukhala ndi zosowa zosiyanasiyana za diso lililonse.
Magalasi a aspheric amatha kupatsa ma lens apakati a refractive index mawonekedwe ang'onoang'ono komanso athyathyathya ngati ma lens apamwamba a refractive index, kuchepetsa kupotoza m'mphepete ndikusamalira gawo lalikulu lomwe limakwaniritsa zosowa zonse zamakasitomala.
Nthawi yotumiza: Jan-04-2024