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Yayın Helvacioglu reproducibility index: a new algorithm to evaluate the effects of misalignments on the measurements of retinal nerve fiber layer by spectraldomain OCT(IJO Press, 2015) Helvacıoğlu, Fırat; Uyar, Osman Murat; Tunç, Zeki; Kapran, ZiyaAim: To evaluate the effect of misalignment on the measurements of retinal nerve fiber layer (RNFL) by spectral-domain optical coherence tomography (OCT). Methods: A total of 42 eyes from 21 healthy young subjects underwent RNFL measurements with RTVue spectral-domain OCT (Optovue Inc., Fremont, California, USA). Two baseline measurements with perfectly aligned central circle to the borders of the optic nerve and four misaligned measurements which were misaligned towards to four quadrants were taken. The differences in RNFL between the baseline and misaligned measurements were analyzed with a new algorithm called Helvacioglu reproducibility index (HRI) which is designed to measure the reproducibility of the scans by evaluating the RNFL changes in the four main quadrants. Results: The average RNFL scores of the first two baseline measurements have good correlation (c=0.930) and good reproducibility scores (0.15±0.07). Superior misaligned measurements had significantly lower superior quadrant score and higher inferior quadrant score, similar nasal and little higher temporal scores (P1, P2<0.001, P3=0.553, P4=0.001). Inferior misaligned measurements had significantly higher superior quadrant score and lower inferior quadrant score with similar temporal and little lower nasal scores (P1, P2<0.001, P3=0.315, P4=0.016). Nasal misaligned measurements had significantly higher temporal quadrant score and lower nasal quadrant score with little lower superior and inferior scores (P1, P2, P4<0.001, P3=0.005). Temporal misaligned measurements had significantly higher nasal quadrant score and lower temporal quadrant score with similar superior and little higher inferior scores (P1, P2<0.001, P3=0.943, P4=0.001). Conclusion: Good alignment of the central circle to the borders of optic nerve is crucial to have correct and repeatable RNFL measurements. Misalignment to a quadrant resulted in falsely low readings at that quadrant and falsely high readings at the opposite quadrant.Yayın Idiopathic Isolated Cilioretinal Artery Occlusion Treated with Hyperbaric Oxygen Therapy(TURKISH OPHTHALMOLOGICAL SOC, 2016) Aktas, Serdar; Uyar, Osman Murat; Ozer, Erol; Aktas, Hatice; Eltutar, KadirCilioretinal artery occlusion (CLRAO) is a rare event which has been reported in association with various systemic diseases. We report a case of idiopathic isolated CLRAO treated successfully with hyperbaric oxygen (HBO) therapy. A 26-year-old man presented with sudden, painless vision loss and an inferior hemivisual field defect in the left eye. Fundus fluorescein angiography revealed an occluded cilioretinal artery. After 2 weeks of HBO therapy, visual acuity improved from 20/200 to 20/20. The visual field defect improved.Yayın İdiyopatik İzole Siliyoretinal Arter Tıkanıklığı Gelişen Bir Olguda Hiperbarik Oksijen Tedavisi(2016) Eltutar, Kadir; Uyar, Osman Murat; Aktaş, Serdar; Aktaş, Hatice; Özer, ErolSiliyoretinal arter tıkanıklığı (SLRAT) çeşitli sistemik hastalıklarla birlikte bildirilmiş nadir bir durumdur. Bu çalışmada, hiperbarik oksijen (HBO) tedavisi ile başarılı olarak tedavi edilen idiyopatik izole SLRAT olgusu sunulmaktadır. Yirmi altı yaşında erkek hasta, sol gözünde ani ağrısız görme kaybı şikayeti ile kliniğimize başvurdu. Fundus floresein anjiyografide silioretinal arterde tıkanıklık görüldü. Görme alanı incelemesinde sol gözde alt yarıda defekt saptandı. İki hafta süren HBO tedavisi sonrasında görme keskinliği 20/200'den 20/20'a çıktı. Görme alanı defekti kısmen düzeldi.Yayın Katarakt ve güncel tedavi yaklaşımları(Maltepe Üniversitesi, 2014) Helvacıoğlu, Fırat; Şencan, Sadık; Tunç, Zeki; Uyar, Osman Murat; Kapran, ZiyaKatarakt, oftalmolojide cerrahi ile tedavi edilen en sık hastalıktır. Derlemede patogenezi, cerrahi tedavi seçenekleri ve cerrahi girişimlerdeki gelişmeler özetlenmiştir. Yeni cerrahi tedavi yaklaşımları da incelenmiştir,
