BIFOCAL DA CI GABA

Bifocal

Lens mai fage biyu na hangen nesa ya rabu da layi.Gabaɗaya an keɓe saman don hangen nesa ko nesa na kwamfuta da ƙasa don aikin hangen nesa kamar karatu.

A cikin ruwan tabarau na Bifocal, an bambanta fage biyu na hangen nesa musamman ta abayyanelayi.Yankin karatun ƙasa yana da faɗin 28mm kuma an saita shi a ƙasan tsakiyar layin ruwan tabarau.Matsayin jiki na yanki na bi-focal zai shafi tsayin jiki na ruwan tabarau da aka zaɓa.

Jimlar tsayin ruwan tabarau na ruwan tabarau na Bifocal dole ne ya zama 30mm ko mafi girma.Muna ba da shawarar ruwan tabarau mai tsayi don ƙarin sawa mai daɗi, amma 30 mm shine mafi ƙarancin tsayi don ruwan tabarau na bifocal.Idan firam ɗin da aka zaɓa yana da tsayin ruwan tabarau ƙasa da 30mm, dole ne a zaɓi firam daban don ruwan tabarau na Bifocal.

Na ci gaba

Wannan yana nufin ƙirar ruwan tabarau wanda ya haɗa da fagage da yawa na hangen nesa, ba tare da layuka ba, kuma wani lokaci ana kiransa "no-line multi-focal".A cikin ruwan tabarau mai ci gaba, siffar sashin da aka gyara na ruwan tabarau yana kusan na mazurari ko naman kaza.

A cikin Ma'auni na Ci gaba, babban ɓangaren shine don hangen nesa mai nisa, yana ƙunshewa zuwa ƙananan tsakiya don tsaka-tsakin hangen nesa, a ƙarshe zuwa ɓangaren ƙasa don hangen nesa na karatu.Matsakaici da wuraren karatu ana tsammanin su kasance ƙasa da yanki mai nisa.Standard Progressives sune ruwan tabarau masu ci gaba da aka fi sawa.

A cikin Ci gaban Aiki, babban ɓangaren shine don hangen nesa na tsaka-tsaki, yayin da ɓangaren ƙasa shine don hangen nesa ko karatu;babu hangen nesa mai nisa a cikin Ci gaba na Workspace Progressive.Akwai nau'ikan Ci gaban Wurin Aiki guda biyu: Ci gaba na Tsakiyar Range, da Ci gaba na Kusa-Range.Matsakaicin Ci gaba ya dace da aikin kusa da ya ƙunshi hangen nesa mai nauyi kamar kwamfutocin tebur da tarurruka, yayin da Ci gaban Kusa-Range ya fi dacewa don tsayawa kusa da aiki kamar tsayin karatu, amfani da na'urar hannu, da ƙira.

Tsayin ruwan tabarau na ruwan tabarau mai ci gaba dole ne ya zama 30mm ko mafi girma.Muna ba da shawarar ruwan tabarau mai tsayi don mafi kyawun sawa, amma mafi ƙarancin ruwan tabarau shine 30 mm.Idan wannan firam ɗin yana da girman ruwan tabarau ƙasa da 30mm, dole ne a zaɓi firam daban don ruwan tabarau masu ci gaba.

 


Lokacin aikawa: Dec-10-2020