1.59 PC Polycarbonate Bifocal Lens
Waa maxay muraayadaha polycarbonate?
Muraayadaha Polycarbonate waxaa lagu kala soocaa adkeysigooda, burburka, iyo guryaha ku dhex dhisan ee u adkaysta.Iska caabbinta saamayntu waxay ka soocaysaa muraayadaha kale ee muraayadaha indhaha.Tani waxay ka dhigaysaa doorashada ugu fiican ee dadka leh qaab nololeed firfircoon kuwaas oo aad ugu nugul inay tuuraan ama xoqaan muraayadaha indhaha.Muraayadaha polycarbonate waxay sidoo kale ku fiican yihiin muraayadaha indhaha ee carruurta iyo muraayadaha badbaadada dhakhtarku qoray.
Ka fudud oo ka khafiifsan muraayadaha caaga ah ee caadiga ah ama muraayadaha dhalada, muraayadaha polycarbonate ayaa laga yaabaa inay ku raaxaystaan in la xidho oo weli ma huraan tayada.Kuma darto dhumucda saxda ah ee aragga, waxay yareeyaan qallooca, waxayna xannibaan 100 boqolkiiba shucaaca ultraviolet ee qorraxda (Ilayska UV).
Muraayadaha leh muraayadaha polycarbonate ayaa markii ugu horreysay la sameeyay 1980-meeyadii, ilaa hadda way soo fiicnaanayeen.Dhammaan dahaarka caadiga ah, sida dahaarka ka-hortagga milicsiga, dahaarka u adkaysta xoqidda, iyo tints ayaa lagu dabaqi karaa muraayadahaas.
Sida loo sheego haddii aad u baahan tahay Bifocals
Presbyopia waa xaalad la xiriirta da'da taasoo keenta in aragga u dhow blush.Waxay badanaa u muuqataa si tartiib tartiib ah;waxaad ku dhibtoon doontaa inaad aragto buug ama wargeys meel dhow oo aad si dabiici ah uga sii durki doonto wejigaaga si uu si cad ugu muuqdo.
Ku dhawaad da'da 40, muraayadda crystalline ee isha ku jirta ayaa luminaysa dabacsanaanteeda.Marka uu yar yahay, muraayadani waa mid jilicsan oo dabacsan, si fududna u bedeli karta qaabka si ay u iftiimiso iftiinka retina.Ka dib da'da 40, muraayadda ayaa noqonaysa mid adag, oo si fudud uma beddeli karto qaabka.Tani waxay adkeynaysaa in la akhriyo ama la sameeyo hawlo kale oo dhow.
Muraayadaha Bifocal
Muraayadaha indhaha ee bifocal waxay ka kooban yihiin laba awood lens si ay kaaga caawiyaan inaad ku aragto shay meel fog ka dib markaad lumiso kartida aad si dabiici ah u beddesho diiradda indhahaaga da'da awgeed, sidoo kale loo yaqaan presbyopia.Shaqadan gaarka ah awgeed, muraayadaha bifocal ayaa inta badan loo qoraa dadka ka weyn da'da 40 si ay u caawiyaan magdhowga naafaynta dabiiciga ah ee aragga ee habka gabowga.
Saddex Naqshad ee Lenses-ka Bifocal
Iyadoo aan loo eegin sababta aad ugu baahan tahay rijeeto sixitaan aragga dhow, bifocals dhamaantood si isku mid ah ayay u shaqeeyaan.Qayb yar oo ka mid ah qaybta hoose ee muraayadda ayaa ka kooban awoodda loo baahan yahay si loo saxo araggaaga dhow.Inta soo hartay muraayadda inta badan waxaa loogu talagalay aragtida fogaantaada.Qaybta lenska ee loo qoondeeyay hagaajinta aragga dhow waxay noqon kartaa saddex qaab:
Qaabka 1
Flat Top waxaa loo arkaa mid ka mid ah lenses multifocal ugu fudud si ay ula qabsadaan, sidaas darteed waa bifocal inta badan la isticmaalo (FT 28mm waxaa loo tixraacaa sida cabbirka caadiga ah).Habkan muraayadda sidoo kale waa mid ka mid ah kuwa ugu diyaarsan ee laga heli karo ku dhawaad meel kasta oo ay ku jiraan muraayadaha raaxada.Flat Top waxay isticmaashaa ballaca dhamaystiran ee qaybta siinta isticmaalaha akhriska saxda ah iyo kala guurka fogaanta.
Qaabka 2
Sida magacu tilmaamayo laba-geesoodka wareega ayaa ku wareegsanhoose.Markii hore waxaa loo qorsheeyay in ay ka caawiyaan dadka xirta si ay u gaaraan aagga wax akhriska si fudud.Si kastaba ha ahaatee, tani waxay yaraynaysaa ballaca aragga dhow ee laga heli karo xagga sare ee qaybta.Sababtaas awgeed, laba-geesoodka wareega ah ayaa caan ka yar kuwabifocals-sare.Qaybta wax-akhrisku inta badan waxay ku jirtaa 28mm.
Qaabka 3: La isku daray
Balaadhka qaybta laba geesoodka la isku daray waa 28mm.Naqshadaynta muraayadda ayaa ahcmuuqaal ahaan muraayada ugu muuqaalka fiican ee dhammaan bifocals, oo muujinaya wax calaamad ah oo qayb ah.Si kastaba ha ahaatee, waxaa jira kala duwanaansho isku dhafan oo ah 1 ilaa 2mm inta u dhaxaysa awoodda qaybta iyo warqadda muraayadda.Kala duwanaanshahan isku-dhafka ah ayaa leh aragti qalloocan oo caddayn karta inay tahay mid aan la qabsan karin bukaannada qaarkood.Si kastaba ha ahaatee, sidoo kale waa muraayad loo isticmaalo bukaanada aan la qabsanayn muraayadaha horumarka.
