Menene Bifocal Lens & Yaya Suke Aiki?

Akwai nau'ikan ruwan tabarau iri-iri da yawa da ake samu a yau, yawancinsu suna cika manufa ɗaya ko ma dalilai da yawa.A cikin shafin yanar gizon wannan watan za mu tattauna lens na bifocal, yadda suke aiki, da kuma mene ne amfanin su ga nakasar hangen nesa daban-daban.

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.

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 ɗaya daga cikin siffofi da yawa:

• Rabin wata - kuma ana kiransa lebur-top, madaidaiciya- saman ko sashin D
• Yanki zagaye
• Wuri mai kunkuntar yanki, wanda aka sani da ɓangaren ribbon
• Cikakken rabin ƙasa na ruwan tabarau bifocal da ake kira Franklin, Executive ko E style