Browsing by Author "Uzun, Ö"

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    Surgically Induced Changes in Corneal Viscoelastic Properties After 23-Gauge Pars Plana Vitrectomy Using Ocular Response Analyzer
    Seymenoglu, G; Uzun, Ö; Baser, E
    Purpose: To evaluate surgically induced changes in corneal viscoelastic properties of patients undergoing 23-gauge transconjunctival sutureless vitrectomy (23-G TSV). Methods: The study group consisted of 29 eyes of 29 patients undergoing 23-G TSV. Corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg), corneal compensated intraocular pressure (IOPcc) and central corneal thickness (CCT) were measured by ocular response analyser (ORA), preoperatively and 1 and 3 months postoperatively. Goldmann applanation tonometry (GAT) was also performed in the same time periods. The ORA measurements before and after the surgery were compared statistically. In addition, the ORA measurements of a control group comprising of 29 normal subjects were also compared with the preoperative measurements of the patient group. Finally the relationship between the CH values and the CCT and GAT values was also assessed. Results: The preoperative ORA measurements of the study group were similar to those of the control groups' (p > 0.05 for all). In the study group, mean CH decreased and mean IOPcc increased significantly at 1 month compared with their respective preoperative values (p = 0.04 and p = 0.03, respectively). However CH and IOPcc measurements at 3 months were similar to the preoperative measurements (p > 0.05). Mean CRF, IOPg, GAT and CCT measurements did not change significantly during the study period (p > 0.05). CH was weakly correlated with CCT preoperatively, 1 and 3 months postoperatively (r = 0.33, r = 0.33, r = 0.43, p < 0.05 for all, respectively). There was also a weak but significant correlation between CH and GAT preoperatively (r = 0.42, p = 0.008), 1 month postoperatively (r = 0.36, p = 0.03), 3 months postoperatively (r = 0.40, p = 0.01). Conclusion: Corneal viscoelastic properties are not significantly influenced in the late postoperative period by 23-G TSV which is a minimal invasive vitreoretinal surgical technique.
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    Idiopathic Inflammatory Neuroretinitis Simulating Optic Nerve Sheath Dural Ectasia
    Ilker, SS; Seymenoglu, G; Tarhan, S; Uzun, Ö; Sencan, S
    We report a case of a 32-year-old female patient who presented with decreased vision on both eyes and headache. In fundus examination, both eyes had elevation of the optic disc and star shaped hard exudates in the macula. Magnetic resonance imaging was completely normal except the saccular dilatation of bilateral optic nerve sheath. The patient was treated with oral steroids following high-dose intravenous methylprednisolone. She displayed good anatomical and functional results during the follow-up. This case raises the possibility that optic nerve sheath enlargement, probably induced by an idiopathic inflammatory optic neuritis, may simulate dural ectasia of the optic nerve sheath.
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    Corneal biochemical features of patients with vernal keratoconjunctivitis
    Emre, S; Baser, E; Öztürk, B; Zorlu, S; Uzun, Ö; Gülhan, C
    Vernal keratoconjunctivitis (VKC) is a chronic, bilateral, seasonally exacerbated, allergic inflammation of the ocular surface, involving bulbar and a or tarsal conjunctiva and cornea. The ocular response analyzer (ORA) measures corneal biomechanical properties in vivo by monitoring and analyzing the corneal behavior when its structure is submitted to a force induced by an air jet. This study was designed to examine corneal biomechanical properties and intraocular pressure in patients with VKC, and to compare with control eyes. ORA measurements were performed on the both eyes of 26 patients with VKC (group I) and 14 healthy children who served as the control group (group II). Corneal hysteresis (CH), corneal resistance factor (CRF) and intraocular pressure [Goldmann correlated (IOPg) and corneal compensated (IOPcc)] were recorded with ORA. Mean age of patients with VKC and control groups were 11.3 +/- 5.8 and 10.6 +/- 1.9 years for groups I and II respectively. Mean (+/- SD) of the CH and CRF readings were 10.1 +/- 1.6 versus 10.5 +/- 1.6 (p > 0.05) and 9.5 +/- 1.7 versus 10.8 +/- 1.7 mmHg (p < 0.05), in groups I and II respectively. Mean (+/- SD) of the IOPg and IOPcc recordings were 13.3 +/- 3.4 versus 16.6 +/- 3.6 mmHg (p < 0.05) and 14.3 +/- 3.4 versus 16.9 +/- 3.7 mmHg (p > 0.05) in groups I and II respectively. Statistical analysis revealed significant differences for CRF and IOPg between the study groups. The mean CRF and IOPg values of patients with VKC were lower than those of controls. According to the results of our study, one can conclude that corneal biomechanical property, CRF, could be different in VKC patients compared to normals.