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Öğe Comparison of accelerated and conventional corneal collagen cross-linking for progressive keratoconus(Taylor & Francis Ltd, 2014) Cinar, Yasin; Cingu, Abdullah Kursat; Turkcu, Fatih Mehmet; Cinar, Tuba; Yuksel, Harun; Ozkurt, Zeynep Gursel; Caca, IhsanPurpose: To compare outcomes of accelerated and conventional corneal cross-linking (CXL) for progressive keratoconus (KC). Materials and methods: Patients were divided into two groups as the accelerated CXL group and the conventional CXL group. The uncorrected distant visual acuity (UDVA), corrected distant visual acuity (CDVA), refraction and keratometric values were measured preoperatively and postoperatively. The data of the two groups were compared statistically. Results: The mean UDVA and CDVA were better at the six month postoperative when compared with preoperative values in two groups. While change in UDVA and CDVA was statistically significant in the accelerated CXL group (p = 0.035 and p = 0.047, respectively), it did not reach statistical significance in the conventional CXL group (p = 0.184 and p = 0.113, respectively). The decrease in the mean corneal power (K-m) and maximum keratometric value (K-max) were statistically significant in both groups (p = 0.012 and 0.046, respectively in the accelerated CXL group, p = 0.012 and 0.041, respectively, in the conventional CXL group). There was no statistically significant difference in visual and refractive results between the two groups (p > 0.05). Conclusions: Refractive and visual results of the accelerated CXL method and the conventional CXL method for the treatment of KC in short time period were similar. The accelerated CXL method faster and provide high throughput of the patients.Öğe Comparison of Central Corneal Thickness Measurements with a Rotating Scheimpflug Camera, a Specular Microscope, Optical Low-Coherence Reflectometry, and Ultrasound Pachymetry in Keratoconic Eyes(Taylor & Francis Inc, 2015) Cinar, Yasin; Cingu, Abdullah Kursat; Turkcu, Fatih Mehmet; Cinar, Tuba; Sahin, Alparslan; Yuksel, Harun; Ari, SeyhmusObjective: To compare central corneal thickness (CCT) measurements with a rotating Scheimpflug camera (RSC), noncontact specular microscopy (SM), optical low-coherence reflectometry (OLCR), and ultrasonic pachymetry (UP) in keratoconus (KC) patients. Method: In this prospective study, four CCT measurements taken with an RSC, SM, OLCR, and UP were compared in 81 eyes of 44 consecutive KC patients. The KC patients were divided into four subgroups according to Amsler-Krumeich's KC classification. Results: The RSC and UP measurements of the CCT were not statistically significant in all the groups. Comparison of the SM vs. the OLCR measurements yielded statistically significant differences in all the KC patients and in all KC stages. In all the KC patients, RSC and OLCR showed a high correlation coefficient factor (r = 0.87, p = 0.000). Conclusion: CCT measurements with RSC are comparable to those achieved with UP. Compared with the other devices, according to SM measurements, the central cornea is thicker in all keratoconic eyes and in all KC grades, and it is thinner according to OLCR. RSC, UP, SM, and OLCR should not be used interchangeably in keratoconic eyes.Öğe Comparison of Optical versus Ultrasonic Biometry in Keratoconic Eyes(Hindawi Ltd, 2013) Cinar, Yasin; Cingu, Abdullah Kursat; Sahin, Muhammed; Sahin, Alparslan; Yuksel, Harun; Turkcu, Fatih Mehmet; Cinar, TubaPurpose. To compare the measurements of optical versus ultrasonic biometry devices in keratoconic eyes. Materials and Methods. Forty-two eyes of 42 keratoconus (KC) patients enrolled in the study were examined. Clinical and demographic characteristics of the patients were noted, and detailed ophthalmological examination was performed. Following Pentacam measurements, central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), and axial length (AL) were obtained using the Lenstar and US biometer to determine the reproducibility of the measurements between the two devices in keratoconic eyes. The Bland-Altman method was used to describe the agreement between the two devices. Results. The Lenstar could not measure at least one of the biometric properties in one eye and did not automatically give the corrected ACD in 2/3 of our study population. The Lenstar measured CCT (average difference 5.4 +/- 19.6 mu m; ICC = 0.90; P < 0.001), LT (average difference 0.13 +/- 0.17 mm; ICC = 0.67; P < 0.001), and AL (average difference 0.10 +/- 0.76 mm; ICC = 0.75; P < 0.001) thinner than US biometer, whereas it measured ACD (average difference 0.18 +/- 0.17 mm; ICC = 0.85; P < 0.001) deeper than US biometer in keratoconic eyes. Conclusion. Although the difference between the measurements obtained using the two devices might be clinically acceptable, US biometry and Lenstar should not be used interchangeably for biometric measurements in KC patients.Öğe Spontaneous bilateral corneal perforation in a patient with ichthyosis(Springer, 2014) Cinar, Yasin; Selcuk, Caferi Tayyar; Cingu, Abdullah Kursat; Turkcu, Fatih Mehmet; Yuksel, Harun; Yildirim, Adnan; Cinar, TubaWe present an 8-month-old female patient with bilateral spontaneous corneal perforation and lamellar ichthyosis. On examination, the skin of the body and face of the patient was completely dry and scaly. Cicatricial ectropion and descemetocele with small perforations were seen. Double-layered amniotic membrane transplantation on the cornea with eyelid construction was performed on both eyes. At the 6-month follow-up, lower eyelid minimal ectropion formation and inferior corneal leukoma were seen bilaterally. In ichthyosis patients, the cornea should be monitored closely due to the risk of severe visual loss and corneal perforation.
