Person: DERİCİOĞLU, VOLKAN
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DERİCİOĞLU
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VOLKAN
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Publication Metadata only Choroidal varix elevates macula following Valsalva manoeuvre(BMJ PUBLISHING GROUP, 2014) ÇERMAN, EREN; Cerman, Eren; Eraslan, Muhsin; Dericioglu, Volkan; Sahin, Ozlem; Cekic, Osman; Mahmutyazicioglu, KamranPublication Metadata only Quantitative measurement of horizontal strabismus with digital photography(MOSBY-ELSEVIER, 2019) ÇERMAN, EREN; Dericioglu, Volkan; Cerman, ErenPURPOSE To develop a method to calculate the gaze angle in photographs and to determine its validity and reliability in real strabismus patients. METHODS Photographs of eyes from 15 orthophoric subjects (n = 1,022) with known gaze angle and imaging distance were investigated with the help of a smartphone application developed by the authors. The application provided measurements of the distance from the geometrical center of the cornea to the light reflex (RD) and corneal diameter (CD). The RD/CD ratio of each gaze angle was recorded. To estimate the eyes' gaze angle, an equation to determine the best-fit line for the gaze angle data according to each RD/CD ratio was created. In a second clinical analysis, this equation was applied to photographs of real strabismus patients (n = 72), and the results were compared with measurements taken by a double-masked strabismus specialist. Separately, an equation was created to calculate the imaging distance using the given interpupillary distance. RESULTS There was a high correlation between the real and estimated gaze angles (r = 0.990, P < 0.001). The mean error of the estimated gaze angle was found to be 0.03(Delta) +/- 4.60(Delta). There was a high correlation between the real and estimated imaging distance (r = 0.997, P < 0.001) and a high correlation between the measurements of the application and the specialist (r = 0.966, P < 0.001). The average error was -0.68(Delta) +/- 6.1(Delta), and the reliability was high (Cronbach's alpha = 0.983). CONCLUSIONS The application measured horizontal strabismus in photographs with high reliability.Publication Metadata only Neurodegeneration in ocular and central nervous systems: optical coherence tomography study in normal-tension glaucoma and Alzheimer disease(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2015) ÇERMAN, EREN; Eraslan, Muhsin; Cerman, Eren; Cekic, Osman; Balci, Sevcan; Dericioglu, Volkan; Sahin, Ozlem; Suer, Devran; Chabou, Biman; Tuncer Elmaci, Emine NeseBackground/aim: To evaluate, in vivo, the optical coherence tomography (OCT) of the retinal nerve fiber layer (RNFL) and ganglion cell complex (GCC) in patients with normal-tension glaucoma (NTG) and those with Alzheimer disease (AD) in comparison with healthy subjects. Materials and methods: This cross-sectional study included 18 patients with NTG, 20 with AD, and 20 control subjects. An ophthalmologic examination and OCT scans of both eyes were performed in all patients. Results: There was a significant reduction in peripapillary RNFL thickness and macular GCC thickness and a significant increase in the global loss volume (GLV) rate in both the NTG and AD patients when compared to the control subjects (P = 0.004, P = 0.006, P < 0.001, respectively). The statistical evaluation showed no difference in any RNFL or GCC parameters between the AD and NTG groups (P > 0.05). There was a negative correlation between disease duration and average RNFL and GCC thicknesses (r = -0.350, P = 0.027 and r = -0.471, P = 0.002, respectively) and a positive correlation between duration and GLV (r = 0.427, P = 0.006) in the AD group. Conclusion: The average RNFL thickness, GCC thickness, and GLV rates may help in the diagnosis of AD as an additional examination and may provide some important clues about the duration of the disease.