Bifocal ruwan tabarau: description, iri, da abũbuwan amfãni

Mutane da myopia yi wahala ganin a tsawon nisa, amma yana iya zama da kyau a yi la'akari da abubuwa a gaban su. Lokacin da farsightedness ne m. Don taimaka a cikin wannan halin da ake ciki, muna bukatar wahayi tabarau. Zai ze cewa biyu matsaloli da aka ambata ne iri dabam dabam, amma ba haka. Popular sau da yawa, mutane masu shekaru sama da shekaru 40, ya lura a jihar inda yana da wuya a mayar da hankali a kan abubuwa located biyu kusa da nesa. Kuma a sa'an nan taimaka da musamman ruwan tabarau.

bifocals

Lokaci bai tsunduma wani, da kuma bayan wani shekaru jikin mutum evinces wasu alamu na tsufa. Wannan shi ne musamman m, a cikin hali na gani inji, wanda mafi yawan mutane sun raunana da shekaru 40, da kuma a nan gaba da halin da ake ciki ne kawai samun muni.

Age presbyopia auku saboda asarar elasticity da ruwan tabarau na tsohon, tare da sakamakon cewa tasowa farsightedness. A hade tare myopia muhimmi a cikin sãɓãwar launukansa digiri, da yawa daga mutane, shi halitta wani m bukatar musamman kayan aikin.

Al'ada hangen nesa da tabarau zai iya taimaka, amma ga daban-daban dalilai bukatar yin amfani da ruwan tabarau iri-iri. Shi ne ba ko da yaushe m, kuma domin wasu ma results a cikin gagarumin sharar gida. Abin farin, kimiyya ya gano wata hanyar fita daga wannan halin da ake ciki, mu hada abin da aka nufi ga wata gaba daya m raga. A sakamakon haka, fiye da shekaru 200 da suka wuce da shi da aka kirkiro bifocal ruwan tabarau. Menene su musamman?

Da sabuwar dabara da kuma kyautata

A farko tunani, wanda ya rubuta na bifocal ruwan tabarau na tabarrau, Dates baya ga shekara 1784 da kuma aka dangana wa Benjamin Franklin, sanannen American siyasa da kuma ba kalla sanannen kirkiro.

A cikin wata wasika zuwa ga wani abokin ya ce cewa ya ɗauki biyu daga ruwan tabarau rama domin myopia da hyperopia, da kuma yanke kowane kashi biyu, da alaka da kuma sanya a cikin wani firam. A sakamakon haka ne cewa kasa halves sun, ta hanyar abin da ya dace don duba miƙe, kuma a saman - guda domin duba abubuwa a mafi nisa. A kaifi iyaka tsakanin sassa daban daban na taimaka wa fahimci inda mafi kyau ga mayar da hankali look. A takaice, shi ne kamar ruwan tabarau. Bifocals da zarar tsiwirwirinsu Popularity tsakanin marasa lafiya, da kuma ba da karshe rawa a cikin wannan da aka buga ta gabatarwa da su likitoci.

Saboda babban bukatar hakan ya zama dole a ci gaba da wannan sabuwar dabara. A tsawon lokaci, akwai lokutta da cewa ba kunshi halves, da kuma neman a matsayin idan daya ruwan tabarau aka located ciki da sauran. Location ƙarin gilashin Tantancewar cibiyar yayi dace da shugabanci na view a lokacin da, misali, karanta ko rubuta. A wannan yanayin, da miƙa mulki iyaka kasance bayyana.

tasiri

Domin shekara ɗari biyu, bifocal ruwan tabarau su ne kawai kayan aiki da ba ka damar ba da wani sashe nau'i biyu daga tabarau da kuma sosai ga na kusa da na a mafi nisa. A sakamakon haka ne ko da yaushe a bayyane a lokaci daya - wani mutum nan take ta zama da tsabta na hangen nesa da kuma iya manta game da matsaloli. Ga wasu lokaci kana bukatar ka samu amfani da sabon tabarau, amma wannan lokaci da wuya yana dogon. Sun tabbatar da kansu a matsayin mai tabbatar da kayan aiki, ko da yake wannan ruwan tabarau na iya zama wani lokaci ma ƙato da kuma sha'awar ta. Ga mutane da yawa - wannan shi ne wani tsanani dalilin ta yi watsi da yin amfani da irin wannan tabarau.

Tare da ci gaba a fasaha da damar yin mafi gilashin ciki har da wani sumul miƙa mulki, yin ruwan tabarau bifocal rabu amfani. Duk da haka, ba su bace gaba daya.

lambar sadarwa ruwan tabarau

Da yawa mutane ba su son tabarau. Don wasu dai kawai m, wasu tuna yara, a lokacin da hõre izgili, da sauransu warwatse da kuma kullum rasa abubuwa. A takaice, da maki, wanda zai zama marar-ganuwa, amma zai yi aiki kawai, kazalika da al'ada, nan take ya zama hit. Saboda haka akwai lambar sadarwa ruwan tabarau cewa aiki a kan daidai da wannan manufa, amma ba a gaban idonsa, amma kai tsaye a kan surface. Zones na daban-daban Refractive kurakurai ne kamar guda yanki - a gaban almajiri. Ya danganta da yadda mutum ya dubi kusa abu ko mai nisa, cewa image za a kimanta a fili a kan haske a jikin. Bifocal lamba ruwan tabarau ne, ba shakka, da sosai m mika mulki tsakanin wadannan bangarori. Wannan cinma wata halitta kyau hangen nesa tsabta.

multifocal ruwan tabarau

Bifocals aka hankali Fading a cikin tarihi, kamar yadda suka maye gurbin wani sabon sabuwar dabara. Bugu da kari zuwa nesa da kusa iyaka, wanda yana da yanki, akwai abin da ake kira miƙa mulki. Yana kuma taka muhimmiyar rawa, shi ne ba abin mamaki bane cewa wannan factor fara da za a gani a cikin ra'ayi na gyara.

Irin wannan ruwan tabarau kuma za a iya kira m, kuma suna da wani daban-daban tsarin. Dangane da halaye na zaba aspheric, ko concentric zobe zane. Wannan ne warware ta likita a cikin ganewar asali, don haka kada ka yi kokarin karba gilashin da kanka. Akwai gagarumin ba kawai zane, amma kuma abu, musamman idan ba game da tabarau da kuma lambar sadarwa ruwan tabarau a.

batun farashin

Da mafita ga presbyopia matsala ne samuwa ga kusan kowane kasafin kudin. Kadan m bifocal ruwan tabarau, farashin wanda dabam dangane da abin da yake a kan gungumen azaba: a kan tabarau ko lamba kayayyakin, suna a cikin kewayon daga 1 zuwa 3.5 dubu rubles. Wani wuri umurnin su dõmin su ga kasa kudi, amma mai kyau, high quality-kimiyyan gani da hasken wuta ne ko da yaushe cheap, amma ba skimp a kan kiwon lafiya.

Progressive ruwan tabarau ne mafi tsada - daga 4 zuwa game da 13 dubu rubles, dangane da ƙasar yi, abu, zane, da dai sauransu ...

A karshe, akwai damar da za su rabu da wannan matsala da zarar kuma ga dukan - wani aiki. Don manta game bifocal lamba ruwan tabarau da kuma sauran kaya, za ka iya kawai sa a cikin wani sabon ruwan tabarau na ido. Irin wannan aiki zai kudin game da 160 da dubu. Akwai darajan shi, shi ne wuya a ce, amma kome ba, ba shakka, bã ya amfãnar da na halitta hangen nesa.