Browsing by Author "Havuz, Erol"

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Covıd-19 Pandemisinin Oftalmologların Klinik Tutum ve Alışkanlıklarına Etkisinin Araştırılması: Bir Anket Çalışması
(2021) Ozgur, Gokhan; Gokmen, Onur; Beyazyıldız, Özlem; Havuz, Erol
Amaç: Koronavirüs hastalığı-2019 [coronavirus disease-2019 (COVID-19)] pandemisi kısa süre içerisinde tüm dünyada hızla yayı- lırken, hastalarla çok yakın temas gerektiren oftalmolojik muayeneler de oftalmologlar açısından hastalık bulaş riskini artırmaktadır. Bu ça- lışmada, oftalmologların kendilerini korumak adına göz polikliniğinde kullandıkları çeşitli kişisel koruyucu kıyafet, ekipmanlar ile pandemi sürecinde hastalara karşı yaklaşım ve tutum değişikliklerinin incelen- mesi hedeflenmiştir. Gereç ve Yöntemler: Türkiye’de pandemi baş- langıcından itibaren 3 aylık dönem içerisinde oftalmologların poliklinikte maske, kıyafet, biyomikroskop nefes kalkanı, koruyucu gözlük, eldiven kullanımı, kontakt lens verme alışkanlıkları, cerrahi uy- gulamalar, hasta sayıları, hastalara karşı tutumları, geçirilmiş COVID- 19 enfeksiyon öyküleri, COVID-19 pozitif hasta temasları ve oftalmoloji dışı aldıkları COVID-19 görevleri hakkında 22 soruluk anket hazırlanarak, Türkiye’de görev yapan ve ulaşılabilen tüm oftal- mologlara gönderilerek, elde edilen veriler analiz edildi. Bulgular: Ça- lışmaya, 112 gönüllü oftalmolog katılmıştır. Katılımcıların tamamı poliklinikte maske kullanırken, %79,6’sı koruyucu kıyafet, %64,5’i yüz koruyucu ekipman, %96,4’ü biyomikroskop nefes kalkanı kullanmakta idi. Katılımcıların %44’ü oftalmoloji dışı COVID-19 görevinde bulu- nurken, %92’sinin kontakt lens verme, %93’ünün ise cerrahi rutini pan- demi sürecinde değişmiştir. Hastalarla olan iletişim, hasta sayıları, muayene süreleri de değişen oranlarda pandemi sürecinden etkilen- miştir. Sonuç: Oftalmologların, kişisel koruyucu ekipman ve kıyafet- ler konusunda tutum ve davranışları değişkenlikler göstermektedir. Pandemi sürecinde birçok oftalmolog, alanları dışında pandemi görev- lerinde bulunmuşlardır ve bu süreç oftalmologların hastalarla olan ile- tişim ve muayene sürelerini, hasta sayılarını, oftalmologların kontakt lens verme ve cerrahi uygulama gibi rutinlerini değişen oranlarda etki- lemiştir.
In-Vitro Dewetting Properties of Planned Replacement and Daily Disposable Silicone Hydrogel Contact Lenses
(Elsevier, 2021) Havuz, Erol; Gokmen, Onur
Aim: To compare the in-vitro videokeratoscopic surface dewetting properties of new-generation silicone hydrogel (SiH) planned replacement contact lenses (CL) with those of daily disposable CLs. Method: A chrome coated cornea model was used for the in-vitro evaluation of surface dewetting. Pre-lens and post-lens film layers were formed by instilling a normal preservative-free normal saline solution (PFNs) (0.9 %) before and after the placement of the CL on the model cornea. The tests were carried out on fanfilcon A, lotrafilcon B, samfilcon A, and senofilcon A lenses, as well as such daily disposable lenses as delefilcon, nesofilcon A and senofilcon one day. Using videokeratoscopic methods, images were obtained at 30-second intervals up to 180 s in the lens and control groups and were analyzed by the ImajeJ (R) program. Results: The mean measured area of the keratoscopic rings was largest in the fanfilcon group (67.56 mm(2)), followed by 61.53 mm(2) in the lotrafilcon A group and 64.60 mm(2) in the samfilcon group, while the smallest area was measured in the senofilcon A group, at 56.90 mm(2). The area was measured as 64.33, 63.09 and 68.39 mm(2) for the delefilcon, nesofilcon and Senofilcon one day CLs, respectively. The dewetting patterns and properties differed in the CL groups (p < 0.05), while no significant differences were found between the measured areas of the planned replacement and daily disposable CL groups (p > 0.05). Discussion: Videokeratoscopy using in-vitro cornea models has been identified as a reproducible and reliable method for the analysis of the surface dewetting of CLs. The dewetting characteristics of CL groups have been found to differ from each other, despite all being produced from SiH materials. The surface wetting coating has been shown to affect CL dewetting performance.
The Influence of Dead Spaces and the Designs of Injectors on the Amount of Drug Dose in Intra-Vitreal Injection
(Sage Publications Ltd, 2021) Havuz, Erol; Gudul Havuz, Seda; Gokmen, Onur
Aim: To evaluate the dead spaces resulting from different designs of the insulin injectors used for intravitreal injections and the amounts of drug doses. Methods: In the study, five different brands of sterile insulin injectors of 1 mL were used for the test. The weight of the injectors was determined before and after filling the injectors with 0.05 and 0.1 mL distilled water. The weight of the injectors was measured with and without the needle after the water within the injectors had been taken out and weight differences were measured. The difference between the intended amount of fluid to be thrown out and the weight of the fluid remaining in the injector was calculated as percent error. Results: After throwing out 0.05 mL distilled water from the injector, weights of the Beybi(R), Traf(R), Becton Dickinson(R), Ayset(R), and Setojet(R) brands of injectors with 30 G needle were detected to increase the mean 0.0220 +/- 0.006 g, 0.0208 +/- 0.008 g, 0.0355 +/- 0.016 g, 0.0219 +/- 0.017 g, and 0.0150 +/- 0.007 g, respectively compared to the weights of the dry injectors. The 0.1 mL injector group was found to be mean 0.0350 +/- 0.014 g, 0.0264 +/- 0.008 g, 0.0405 +/- 0.015 g, 0.0272 +/- 0.013 g, and 0.0245 +/- 0.014 g, respectively. The maximum increase due to the dead spaces in the injectors was found in the Becton Dickinson(R) injector, both in the 0.05 mL and the 0.1 mL groups (p < 0.000). Conclusion: The injector designs may affect the dose of IVI required to be given. More correct amounts of drugs may be administered via the intra-vitreal route through designs that reduce the dead spaces at the end part of the injector and between the inner wall and the plunger.