Browsing by Author "Kiziltoprak H."

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Alterations of Tear Film and Ocular Surface in Children with Type 1 Diabetes Mellitus
(2020-04-02) Inanc M.; Kiziltoprak H.; Hekimoglu R.; Tekin K.; Ozalkak S.; Koc M.; Bayramoglu E.; Zirh S.; Yuruker S.; Aycan Z.
Purpose: To investigate whether diabetes mellitus (DM) affects ocular surface of children with well-controlled type 1 DM. Methods: Sixty-five diabetic patients and 55 age-matched controls enrolled to study. Detailed ocular surface assessment including, ocular surface disease index (OSDI) questionnaire, tear film break-up time (TBUT) analysis, Schirmer test, and conjunctival impression cytologic analysis were performed. Results: Schirmer test and TBUT results were significantly lower in DM group than controls (p = 0.001, for all). OSDI scores of all participants were within normal range. Impression cytology analysis showed grade 0 changes in all participants and there was no difference between groups for goblet cell density (p > 0.05). The TBUT results were significantly associated with duration of DM (r = −0.309, p = 0.036). Conclusion: Diabetic children without symptoms, signs, and definite diagnosis of dry eye still had lower TBUT and Schirmer test results than controls; however, impression cytology analysis was similar in both groups.
Comparison of wavefront-optimized ablation and topography-guided contoura ablation with LYRA protocol in LASIK
(2019-04-01) Ozulken K.; Yuksel E.; Tekin K.; Kiziltoprak H.; Aydogan S.
PURPOSE: To compare the refractive outcomes and aberration data analysis of wavefront-optimized (WFO) ablation and topography-guided Contoura ablation (TGCA) (Contoura on the WaveLight laser; WaveLight GmbH, Erlangen, Germany) in patients who had laser-assisted in situ keratomileusis (LASIK) for myopia or myopic astigmatism. METHODS: In this comparative contralateral eye study, patients who underwent LASIK with TGCA in one eye and with WFO ablation in the fellow eye were analyzed. Aberration measurements and corneal topography were analyzed using the WaveLight Oculyzer II diagnostic device (Alcon Laboratories, Inc., Fort Worth, TX). Total corneal higher order aberrations (HOAs) including vertical and oblique astigmatism (Z22, Z2-2), coma (Z31, Z3-1), trefoil (Z33, Z3-3), spherical aberration, and Q value were analyzed. These measurements were taken preoperatively and 3 months postoperatively. RESULTS: This study comprised 32 patients. There were no significant differences between both procedures according to postoperative uncorrected and corrected distance visual acuity values, refractive errors, and manifest refraction spherical equivalents within ±0.50 diopters (D) of emmetropia (P > .05). The preoperative corneal HOAs and Q values were also similar between the groups (P > .05). At 3 months postoperatively, the vertical and horizontal coma values in the WFO ablation group were statistically significantly higher compared to the TGCA group (P = .013 and .020, respectively). Less stromal tissue was ablated in the TGCA group compared to the WFO ablation group (P < .001). CONCLUSIONS: Although WFO ablation and TGCA protocols had statistically similar visual outcomes, the TGCA protocol was associated with a significantly lower induction in vertical and horizontal coma and smaller amount of tissue ablation compared to WFO ablation.