Browsing by Author "Utine, Canan Asli"

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Comparison of Anterior Chamber Depth Measurements Taken With the Pentacam, Orbscan Iiz and Iolmaster in Myopic and Emmetropic Eyes
(Wiley, 2009) Utine, Canan Asli; Altin, Feyza; Cakir, Hanefi; Perente, Irfan
This study determined to assess the degree of agreement between anterior chamber depth (ACD) measurements obtained using three different devices and to analyse the relationship between ACD and spherical equivalent (SE) refraction. In this cross-sectional study, 42 eyes of 42 patients with a mean SE of - 4.69 +/- 4.61 D (range 0.00 D to - 14.88 D) were analysed. Measurements of ACD between the corneal epithelium and the anterior surface of the crystalline lens, obtained using the Pentacam, Orbscan IIz and IOLMaster, were compared. The relationships between SE and ACD measurements obtained with different devices were also investigated. The results were analysed using Bland-Altman analyses, single-sample t-test and Pearson's correlation test. Orbscan ACD measurements were an average of 0.05 mm less than Pentacam measurements (p = 0.01). IOLMaster measurements were an average of 0.06 mm less than Orbscan measurements (p < 0.001). None of the ACD values measured by any of the devices were correlated with increasing SE (p > 0.05 for all). There was a weak positive correlation between SE and the difference in ACD measurements with Pentacam and Orbscan (p = 0.04); however, the differences between Pentacam and IOLMaster ACD measurements and Orbscan and IOLMaster ACD measurements seemed to be independent of SE (p = 0.17 and p = 0.54, respectively). The ACD in clinically normal eyes is measured differently by various non-ultrasonic devices. However, the observed mean error between these modalities is too small to create any noticeable difference in refractive outcome. No significant relationship was found between SE and ACD measurements obtained by Pentacam, Orbscan or IOLMaster.
Intracorneal Ring Implantation Using Intralase® With Partial Coverage of the Cone in a Patient After an Alkaline Injury
(Dove Medical Press Ltd, 2011) Cakir, Hanefi; Utine, Canan Asli; Baykara, Mehmet
Purpose: To report the use of intracorneal ring segment (ICRS) implantation in a case of severe corneal thinning and irregularity secondary to alkali burn. Case report: A 33-year-old man who had a history of ocular alkali burn in the right eye was admitted. His best corrected visual acuity was 0.16 with manifest refraction of +5.00 (-7.00 x 180 degrees). Orbscan II (R) revealed steepening of >53 D superiorly, excessive thinning inferiorly with thinnest pachymetric reading of 269 mu m. Two KeraRing (R) segments, 200 mu m thick and 90 degrees arced, were implanted. During intrastromal channel creation by Intralase (R), the inferior half of the applanating cone was covered by a gelatinous paper to prevent the penetration of the laser beam into the anterior chamber. In the first year postoperation, best corrected visual acuity was 0.7 with manifest refraction of +1.50 (-3.50 x 35 degrees). Visante (R) opticial coherence tomography displayed ICRS at a depth of similar to 370 similar to mu m. Conclusion: ICRS implantation with this novel approach may be an option in eyes with severe corneal irregularity and thinning.
Lift and Crack Technique for Risky Cataract Cases
(Elsevier Science inc, 2010) Cakir, Hanefi; Utine, Canan Asli
We describe a technique to manage dense cataract cases After a capsulorhexis of 6.0 to 7.0 mm diameter has been created, the phaco tip is inserted into the nucleus centrally and high vacuum is used to lift the nucleus and elevate it with a tilt to protrude outside the capsular bag distally The chopper is used to segment the nucleus centripetally, starting from the lens equator or just behind, without applying stress to the capsular bag or zonules Further phacoemulsification is maintained by holding the nucleus centrally and chopping it into smaller triangular sectoral pieces. In this horizontal chopping technique, which is done just outside the capsular bag, grasping the nucleus in the center and elevating it with high vacuum instead of depressing one edge of the nucleus to elevate the other edge prevents additional stress to the capsule and zonules.