46 research outputs found
Sales forecast inaccuracy and inventory turnover performance: an empirical analysis of US retail sector
No full textDuration of the operation has no e ect on early visual acuity after small incision lenticule extraction surgery
No full textFemtosecond lenticule extraction for correction of myopia: a 6 month follow-up study
No full textAhmet Demirok,1 Alper Agca,2 Engin Bilge Ozgurhan,2 Ercument Bozkurt,2 Ugur Celik,2 Ali Demircan,2 Nimet Burcu Guleryuz,2 Kadir Ilker Cankaya,2 Omer Faruk Yilmaz3 1Department of Ophthalmology, Medeniyet University, Istanbul, Turkey; 2Beyoglu Eye Training and Research Hospital, Istanbul, Turkey, 3Private Practice, Istanbul, Turkey Aims: To report our initial experience with femtosecond lenticule extraction (FLEX) compared with femtosecond laser-assisted in situ keratomileusis (LASIK). Settings and design: This was a prospective pilot study carried out at the Refractive Surgery Department of the Beyoglu Eye Training and Research Hospital, Istanbul, Turkey. Materials and methods: Surgery was performed on both eyes of 14 consecutive patients with myopia or myopic astigmatism. Patients underwent FLEX in one eye and femtosecond LASIK (FemtoLASIK) in the other eye. The primary outcome was based on uncorrected distance visual acuity, corrected distance visual acuity, and spherical equivalent of the subjective manifest refraction, at 1 week, 1 month, and 6 months postsurgery. Statistical analyses were performed using PAWS Statistics 18. Unpaired Student’s t-test was used to compare the groups. Results: During the last follow-up visit (6 months postsurgery), the mean spherical was −0.37 ± 0.60 diopters (D) (range −1.00 to 0.50) (P 0.05). No complications occurred during surgery or the postoperative period. Conclusion: FLEX is a safe, effective, and predictable procedure for surgical correction of myopia. Refractive results were stabilized within the first postoperative week, and visual acuities were stabilized within the first month, comparable to FemtoLASIK. Keywords: FLEX, femtosecond laser-assisted in situ keratomileusi
Investigation of Hot Stamping Process Parameters in Up & Down Machining on ABS Materials Under Quality Purposes of Different Stamping Processes
No full textAccuracy and precision of cap thickness in small incision lenticule extraction
No full textEngin Bilge Ozgurhan,1 Alper Agca,1 Ercument Bozkurt,1 Baran Gencer,2 Ugur Celik,1 Kadir İlker Cankaya,1 Ahmet Demirok,1,3 Omer Faruk Yilmaz41Beyoglu Eye Training and Research Hospital, Istanbul, Turkey; 2Ophthalmology Department, Faculty of Medicine, Çanakkale Onsekiz Mart University, Çanakkale, Turkey; 3Department of Ophthalmology, Medeniyet University, Istanbul, Turkey; 4Private practice, Istanbul, TurkeyAims: To report and compare the cap thickness predictability of small incision lenticule extraction (SMILE) and flap thickness of femtosecond laser-assisted in situ keratomileusis (femto-LASIK).Settings and design: Beyoglu Eye Training and Research Hospital, Refractive Surgery Department, Istanbul, Turkey. Retrospective pilot study.Materials and methods: Medical records of patients who had SMILE in one eye and femto-LASIK in the other eye were reviewed. Visante corneal Optical Coherence Tomography (OCT) images at 1 week and 1 month post-surgery were analyzed. Both cap and flap thickness at the temporal edge and the nasal edge were measured and compared to each other.Statistical analyses used: PAWS Statistics 18 and unpaired student t-test were used to compare the groups.Results: The study included 66 eyes of 33 patients (24.7 ± 3.8 years, 20 females and 13 males). Mean flap thickness was 114.88 µm ± 4.96 µm, and mean cap thickness was 114.63 µm ± 5.18 µm. In group 1 (SMILE), cap thickness values were 115.84 µm ± 6.84 µm, 114.75 µm ± 7.36 µm, 113.66 µm ± 6.88 µm, and 114.27 µm ± 6.90 µm in measurement zones 1, 2, 3, and 4, respectively. In group 2 (FemtoLASIK), flap corneal thickness values were 115.96 mmHg ± 7.01 mmHg, 114.72 mmHg ± 7.17 mmHg, 113.54 mmHg ± 6.45 mmHg, and 115.30 mmHg ± 6.64 mmHg in measurement zones 1, 2, 3, and 4, respectively. In both groups, no statistically significant change within the measurement zones was observed.Conclusion: The predictability of cap thickness in SMILE surgery does not differ from the femto-LASIK flaps created using the same femtosecond laser platform.Keywords: SMILE, small incision lenticule extractio
Comparison of efficacy between low-fluence and half-dose verteporfin photodynamic therapy for chronic central serous chorioretinopathy
No full textZeynep Alkin,1 Irfan Perente,1 Abdullah Ozkaya,1 Dilek Alp,1 Alper Agca,1 Ebru Demet Aygit,1 Selcuk Korkmaz,2 Ahmet Taylan Yazici,1 Ahmet Demirok1 1Beyoglu Eye Training and Research Hospital, Istanbul, Turkey; 2Hacettepe University Faculty of Science, Department of Statistics, Ankara, Turkey Purpose: To compare the efficacy of low-fluence photodynamic therapy (PDT) and PDT with half-dose verteporfin in chronic central serous chorioretinopathy (CSC). Patients and methods: The medical records of 64 eyes from 60 patients with chronic CSC were retrospectively reviewed; 36 eyes received low-fluence PDT (25 J/cm2) and 28 eyes received half-dose verteporfin PDT (3 mg/m2). The primary outcome measure was the proportion of eyes with complete resolution of subretinal fluid. Secondary outcome measures were the changes in best corrected visual acuity (BCVA) and central foveal thickness, and the proportion of eyes that showed an increase of ≥5 letters in BCVA at the last visit. Results: The mean follow-up period was12.5±4.3 months and 13.1±4 months in the low-fluence group and half-dose group, respectively (P=0.568). Thirty-three eyes (91.6%) in the low-fluence group and 26 eyes (92.8%) in the half-dose verteporfin group showed complete resolution of subretinal fluid (P=0.703). BCVA increased by a mean of 7.4 letters and 4.8 letters in the low-fluence group and half-dose group, respectively (P=0.336). Seventeen eyes (52.8%) in the low-fluence group and 14 eyes (50%) in the half-dose group experienced a gain of ≥5 letters in BCVA (P=0.825). In the low-fluence and half-dose verteporfin group, the mean baseline central foveal thickness was 351±90 µm and 341±96 µm, and significantly decreased to 188±61 µm and 181±47 µm, respectively (P<0.01). Conclusion: Both treatments resulted in complete subretinal fluid resolution in most of the eyes, with significantly better visual acuity outcomes compared to baseline at the last visit. Keywords: low-fluence, half-dose verteporfin, photodynamic therapy, central serous chorioretinopath
Importance of Strategic Flexibility on the Knowledge and Innovation Relationship: An Emerging Market Study
No full textAbstractThis study seeks to explore the impact of strategic flexibility on the relationship between knowledge management and innovation performance. In order to achieve this, a self- administrated questionnaire was conducted on a sample of 187 firms from different industries in Turkey and a couple of hypotheses were tested. The two way interaction of knowledge management and strategic flexibility was associated more strongly with innovation performance than the direct and single relationship of knowledge management and innovation performance. Therefore, it was found that the effectiveness of knowledge management leading to innovation performance is contingent on strategic flexibility
Femtosecond lenticule extraction performed on a wrong meridian and effectively reversed by excimer laser ablation
No full textThree-year outcomes of a novel toric intraocular lens implantation for moderate-high myopic astigmatism in phakic eyes
No full textPurpose!#!To investigate the three-year visual, refractive outcomes and adverse events of the Eyecryl toric phakic IOL (pIOL) for moderate-to-high myopic astigmatism.!##!Methods!#!This retrospective study included eligible patients who underwent refractive surgery in one or both eyes with Eyecryl toric pIOL for myopic astigmatism. The efficacy, safety, predictability, rotational stability, vector analysis, and adverse events were evaluated in patients with spherical refraction from - 4.50 to -17.00 diopters (D) and cylindrical refraction from - 0.75 to -5.50 D.!##!Results!#!Fifty-two eyes of 28 patients were included in the study. The mean efficacy and safety index were 1.12 ± 0.35 and 1.38 ± 0.42, respectively. The mean manifest refraction spherical equivalent was - 10.06 ± 2.69 D and - 0.64 ± 0.61 D preoperatively and postoperatively at 36 months, respectively. The mean manifest astigmatism was - 2.06 ± 1.16 D and - 0.44 ± 0.48 D preoperatively and 36 months postoperative, respectively. During the final examination, 70% of the eyes showed an increase in CDVA of one or more lines compared to their preoperative state. There was a cumulative endothelial cell loss of 3.1% at 36 months postoperatively. One eye developed visually significant anterior subcapsular opacity, whereas another eye experienced pIOL opacification.!##!Conclusion!#!The Eyecryl toric pIOL demonstrated satisfactory visual acuity and refractive outcomes, as assessed by efficacy, safety and stability over a three-year period
