Bifocal Lens
Yadda ake Faɗa Idan Kuna Buƙatar Bifocals
Presbyopia yanayi ne da ke da alaƙa da shekaru wanda ke haifar da ɓarna kusa da gani.Yakan bayyana a hankali;Za ku yi gwagwarmaya don ganin littafi ko jarida kusa kuma za ku matsar da shi daga fuskar ku don ya bayyana a fili.
A kusan shekaru 40, ruwan tabarau na crystalline a cikin ido ya rasa sassauci.Lokacin matashi, wannan ruwan tabarau yana da taushi kuma mai sassauƙa, a sauƙaƙe yana canza siffa ta yadda zai iya mai da hankali kan haske akan ido.Bayan shekaru 40, ruwan tabarau ya zama mafi tsauri, kuma ba zai iya canza siffar da sauƙi ba.Wannan yana sa ya zama da wahala a karanta ko yin wasu ayyuka na kusa.
Bifocal Lens
Gilashin tabarau na Bifocal sun ƙunshi ikon ruwan tabarau guda biyu don taimaka maka ganin abubuwa a kowane nesa bayan ka rasa ikon canza yanayin idanunka a zahiri saboda shekaru, wanda kuma aka sani da presbyopia.Saboda wannan takamaiman aikin, ruwan tabarau na bifocal an fi rubuta su ga mutanen da suka wuce shekaru 40 don taimakawa ramawa ga lalacewar hangen nesa na dabi'a saboda tsarin tsufa.
Zane-zane Uku na Bifocal Lenses
Ko da menene dalilin da kuke buƙatar takardar sayan magani don gyaran hangen nesa kusa, bifocals duk suna aiki iri ɗaya.Ƙananan yanki a cikin ƙananan ɓangaren ruwan tabarau ya ƙunshi ikon da ake buƙata don gyara hangen nesa na kusa.Sauran ruwan tabarau yawanci shine don hangen nesa na ku.Bangaren ruwan tabarau da aka keɓe don gyaran hangen nesa na kusa zai iya zama sifofi uku:
Siffar 1
Ana ɗaukar Flat Top a matsayin ɗayan mafi sauƙin ruwan tabarau multifocal don daidaitawa, don haka shine mafi yawan amfani da bifocal (FT 28mm ana kiransa daidaitaccen girman).Wannan salon ruwan tabarau kuma yana ɗaya daga cikin mafi sauƙin samuwa a kusan kowane matsakaici kuma ya haɗa da ruwan tabarau na ta'aziyya.Flat Top yana amfani da cikakken faɗin ɓangaren yana bawa mai amfani ingantaccen karatu da canjin nisa.
Siffar 2
Kamar yadda sunan ya nuna zagaye bifocal yana zagaye a ƙasa.An tsara su ne da farko don taimaka wa masu sawa su isa wurin karatu cikin sauƙi.Koyaya, wannan yana rage faɗin hangen nesa kusa da ake samu a saman ɓangaren.Saboda wannan, zagaye na bifocals ba su da mashahuri fiye da masu bifocals.
Siffa ta 3: Haɗe
Nisa na ɓangaren bifocal ɗin da aka haɗa shine 28mm.Wannan zanen ruwan tabarau shinecsmetically mafi kyawun ruwan tabarau na duk bifocals, yana nuna kusan babu alamar sashi.Koyaya, akwai kewayon haɗakarwa na 1 zuwa 2mm tsakanin ikon yanki da takardar sayan ruwan tabarau.Wannan kewayon haɗakarwa yana da gurɓataccen hangen nesa wanda zai iya tabbatar da cewa ba zai iya daidaitawa ga wasu marasa lafiya ba.Koyaya, shima ruwan tabarau ne da ake amfani dashi tare da marasa lafiya waɗanda basu dace da ruwan tabarau masu ci gaba ba.
