Yazar "Yagci, Ramazan" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    Comparison of Anterior Segment Measurements With a Dual Scheimpflug Placido Corneal Topographer and a New Partial Coherence Interferometer in Keratoconic Eyes
    (Lippincott Williams & Wilkins, 2015) Yagci, Ramazan; Kulak, Ali Ender; Guler, Emre; Tenlik, Aylin; Guragac, Fatma Betul; Hepsen, Ibrahim Feyzi
    Purpose:To evaluate the repeatability and agreement of the anterior segment measurements obtained using the Galilei dual Scheimpflug analyzer (Galilei DSA; Ziemer) and Nidek AL Scan (Nidek CO, Aichi, Japan) biometry in keratoconic and normal eyes.Methods:Three consecutive measurements were performed by the same examiner using both devices in 62 healthy and 88 keratoconic eyes. Central corneal thickness (CCT), anterior chamber depth, keratometry readings (K) [in flattest meridian (Kf), in steepest meridian (Ks), and mean (Km)], and white-to-white distance were evaluated. Repeatability was assessed by calculating the within-subject SD and coefficient of variation. The agreement between both devices was assessed using the Bland-Altman method.Results:Both devices achieved excellent repeatability for all parameters in each group. The 95% limits of agreement (LoA) between both devices were also very narrow and acceptable for all parameters in normal corneas. However, the 95% LoA for agreement was large for CCT and measurements related to K (Kf, Ks, and Km) using both 2.4 and 3.3 mm in keratoconic eyes. In addition, compared with the Galilei DSA, K values of the Nidek AL Scan using a diameter of 3.3 mm showed slightly closer 95% LoA than those obtained using a diameter of 2.4 mm.Conclusions:In normal eyes, the Galilei DSA and Nidek AL Scan can be used interchangeably for anterior segment measurements. In keratoconic eyes, both devices yielded interchangeable anterior chamber depth and white-to-white distance measurements, whereas CCT and keratometry measurements showed clinically significant differences.
  • Küçük Resim Yok
    Öğe
    Comparison of Central Corneal Thickness, Thinnest Corneal Thickness, Anterior Chamber Depth, and Simulated Keratometry Using Galilei, Pentacam, and Sirius Devices
    (Lippincott Williams & Wilkins, 2014) Anayol, Mustafa A.; Guler, Emre; Yagci, Ramazan; Sekeroglu, Mehmet A.; Yilmazoglu, Meltem; Tirhis, Hakan; Kulak, Ali E.
    Purpose: The aim was to evaluate the agreement in the central corneal thickness (CCT), thinnest corneal thickness (TCT), anterior chamber depth (ACD), and mean simulated keratometry (simK) measurements using Pentacam, Galilei, and Sirius Scheimpflug systems in normal eyes. Methods: Anterior segment measurements were performed with Pentacam, Galilei, and Sirius devices in 32 healthy subjects. The right eye of each participant was selected. Measurements obtained with the 3 systems were compared using repeated-measures analysis of variance and Bonferroni multiple comparisons test. Results: Analysis of variance determined a significant difference in the anterior segment measurements of CCT, TCT, ACD, and simK between the 3 devices (P < 0.001). Pairwise comparisons of CCT and TCT measurements were significantly different except for the comparison between Pentacam and Sirius. All pairwise comparisons for ACD were statistically significant. The pairwise comparison results for simK values showed that the Galilei and Sirius systems demonstrated better agreement with each other than with Pentacam. Conclusions: The results of this study suggest that the Pentacam, Galilei, and Sirius Scheimpflug systems should not be accepted as interchangeable for CCT, TCT, ACD, and simK in healthy subjects.
  • Küçük Resim Yok
    Öğe
    Evaluation of Aqueous Endocan and Endostatin Levels in Patients With Pseudoexfoliation Syndrome
    (Lippincott Williams & Wilkins, 2019) Yagci, Ramazan; Dervisogullari, Serdar; Guler, Emre; Totan, Yueksel; Hepsen, Ibrahim F.
    Purpose: The purpose of the present study was to evaluate the aqueous humor endocan and endostatin levels in patients with pseudoexfoliation (PEX) syndrome and to compare the results with healthy individuals. Materials and Methods: Twenty nine cataract patients with PEX syndrome (PEX group) and 32 cataract patients without PEX syndrome (control group) were enrolled in the study. Endocan and endostatin were measured in the aqueous humor of the PEX and control groups by enzyme-linked immunosorbent assay. Results: There was no difference between the PEX and control groups in terms of age (P=0.721) and sex (P=0.902). The aqueous levels of endocan in patients with PEX (26.39 +/- 5.80 pg/mL) was significantly higher than in the control group (11.42 +/- 2.44 pg/mL) (P=0.039). The aqueous levels of endostatin was 12.00 +/- 1.35 ng/mL in the PEX group and 14.22 +/- 3.31 ng/mL in the control group, however, the difference was not statistically significant (P=0.41). Conclusions: The findings of the present study could suggest that the increased levels of aqueous endocan may be related to pathogenesis of PEX. However, levels of aqueous endostatin did not show any significant difference in PEX.
  • Küçük Resim Yok
    Öğe
    Influences of Topical Cyclopentolate on Anterior Chamber Parameters With a Dual-Scheimpflug Analyzer in Healthy Children
    (Slack Inc, 2015) Guler, Emre; Guragac, Fatma Betul; Tenlik, Aylin; Yagci, Ramazan; Arslanyilmaz, Zeynel; Balci, Mehmet
    Purpose: To evaluate the changes of anterior segment parameters following the topical instillation of cyclopentolate hydrochloride 1% with the Galilei dual-Scheimpflug analyzer (GSA) (Ziemer Ophthalmology Co., Port, Switzerland) in healthy children. Methods: Fifty children (29 boys, 21 girls) were evaluated before and 60 minutes after instillation of three drops of 1% cyclopentolate hydrochloride using the GSA. The measurements before and after cycloplegia, including anterior chamber depth (ACD), anterior chamber angle (ACA), anterior chamber volume (ACV), central corneal thickness (CCT), and pupil size, were evaluated using the paired t test. Results: The mean age of the patients was 10.27 +/- 3.32 years (range: 5 to 15 years). Measurements between the two sessions were significantly different for all parameters (P < .05), except for CCT (P > .05). Conclusions: The GSA demonstrated a statistically significant increase in ACD, ACV, ACA, and pupil size following the topical application of cyclopentolate hydrochloride 1%. These results should be considered during biometric measurement and refractive surgery planning.
  • Küçük Resim Yok
    Öğe
    Repeatability and reproducibility of a new optical biometer in normal and keratoconic eyes
    (Elsevier Science Inc, 2015) Yagci, Ramazan; Guler, Emre; Kulak, Ali Ender; Erdogan, Beyza Doganay; Balci, Mehmet; Hepsen, Ibrahim Feyzi
    PURPOSE: To evaluate the repeatability and reproducibility of measurements obtained by a new optical biometer (Nidek AL-Scan) in normal eyes and keratoconic eyes. SETTING: Department of Ophthalmology, Turgut ozal University, Medical School, Ankara, Turkey. DESIGN: Evaluation of diagnostic technology. METHODS: To assess the repeatability and reproducibility of the optical biometer, 2 independent examiners performed 3 consecutive measurements. The following parameters were evaluated: central corneal thickness (CCT), anterior chamber depth, axial length (AL), corneal dioptric power in the flattest meridian (flat keratometry [K]) and in the steepest meridian (steep K), and white-to-white (WTW) distance. Repeatability was assessed using the within-subject standard deviation (S-w), repeatability, and precision. Reproducibility was evaluated using the 95% limits of agreement proposed by Bland and Altman. RESULTS: Thirty healthy subjects and 27 patients with keratoconus were evaluated. Both examiners achieved high repeatability for all parameters in each group except for the steep K measurement in keratoconic eyes performed by examiner 2 (S-w = 3.341). The WTW in normal eyes and the CCT and steep K in keratoconic eyes showed less repeatability. In both groups, the smallest range of agreement was in AL measurements whereas the largest was in CCT measurements. In keratoconic eyes, the range of agreement for steep K was also greater (3.766). CONCLUSIONS: The precision of the measurements obtained by the new optical biometer was high.
  • Küçük Resim Yok
    Öğe
    Repeatability and Reproducibility of Anterior Segment Measurements in Normal Eyes Using Dual Scheimpflug Analyzer
    (Turkish Ophthalmological Soc, 2015) Altiparmak, Zeynep; Yagci, Ramazan; Guler, Emre; Arslanyilmaz, Zeynel; Canbal, Metin; Hepsen, Ibrahim F.
    Objectives: To assess the repeatability and reproducibility of anterior segment measurements including aberrometric measurements provided by a dual Scheimpflug analyzer (Galilei) system in normal eyes. Materials and Methods: Three repeated consecutive measurements were taken by two independent examiners. The following were evaluated: total corneal power and posterior corneal power, corneal higher-order wavefront aberrations (6.0 mm pupil), pachymetry at the central, paracentral, and peripheral zones, and anterior chamber depth (ACD). Repeatability was assessed by calculating the within subject standard deviation, precision, repeatability, and intraclass correlation coefficient (ICC). Bland-Altman analysis was used for assessing reproducibility. Results: Thirty eyes of 30 patients were included. The best ICC values were for corneal pachymetry and ACD. For both observers, acceptable ICC was also achieved for the other parameters, the only exceptions being posterior corneal astigmatism and total high order aberration. The 95% LoA (Limits of Agreement) values for all measurements showed small variability between the two examiners. Conclusion: The Galilei system provided reliable measurements of anterior segment parameters. Therefore, the instrument can be confidently used for routine clinical use and research purposes.
  • Küçük Resim Yok
    Öğe
    Repeatability and reproducibility of Galilei measurements in normal keratoconic and postrefractive corneas
    (Elsevier Science Bv, 2014) Guler, Emre; Yagci, Ramazan; Akyol, Mesut; Arslanyilmaz, Zeynel; Balci, Mehmet; Hepsen, Ibrahim F.
    Objective: To assess the repeatability and reproducibility of the anterior segment measurements performed with a dual Scheimpflug analyzer (Galilei) in normal, keratoconic and post-refractive surgery corneas. Methods: To evaluate the repeatability, two additional measurements were performed by the first examiner. To assess reproducibility, this was later followed by a single reading by the second examiner. The following parameters were recorded and evaluated in this study; central corneal thickness (CCT), thinnest corneal thickness (TCT), mean total corneal power (TCP) in central (0-4 mm), mean posterior corneal power (PCP) in central (0.5-2 mm), anterior and posterior elevation (best fit sphere [BFS]) in central 8 mm anterior and posterior eccentricity (epsilon(2)) in central 8 mm. Repeatability and reproducibility for each corneal parameter was assessed using the Bland-Altman analysis. Results: Each of the three groups was consisted of 20 subjects (totally 60 patients, 30 men and 30 women). The 95% LoA for repeatability was very small, indicating small discrepancies between measurements related to CCT. Acceptable repeatability was also achieved for the other parameters in each group. However, the 95% LoA for value TCP was larger in keratoconic eyes. The 95% LoA for reproducibility was also very small, and acceptable for all measured parameters in each group. In addition, the 95% LoA was larger for the measurement of CCT and TCT for postrefractive corneas. Conclusions: The anterior segment measurements provided by Galilei showed good repeatability and reproducibility for normal, keratoconic and postrefractive corneas. (C) 2014 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.