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    Duane Retraction Syndrome: Clinical Features and a Case Group-Specific Surgical Approach
    (Taylor & Francis Inc, 2019) Gunduz, Abuzer; Ozsoy, Ercan; Ulucan, Pamuk Betul
    Purpose: To describe the clinical features of patients with Duane retraction syndrome (DRS) and evaluate the outcomes of surgical approaches based on the characteristics of each patient. Methods: The records of 38 Caucasian subjects with DRS were retrospectively reviewed. The patients were classified as type I, II, or III based on the Huber Classification. Ten patients underwent unilateral medial rectus (MR) recession due to abnormal head posture (AHP) and/or esotropia. Four patients underwent Y-splitting and recession of the lateral rectus (LR) with MR recession due to AHP and/or esotropia, upshoot, and globe retraction. Results: There was a preponderance of unilaterality, female gender, left eye, type I, orthotropia, upshoot, and low refractive error. All patients demonstrated globe retraction and fissure narrowing. AHP was only present in unilateral cases. Nine patients had amblyopia. More than half of the patients over 5 years of age had decreased stereopsis. MR recession decreased AHP to less than 8 degrees in all patients. Y-splitting and recession of the LR eliminated upshoot in all four patients. One patient who underwent an 8-mm MR recession demonstrated -2 adduction limitation. Conclusions: The DRS patients in our study demonstrated features that are consistent with previous reports in the literature. This study emphasizes the need to consider disease classification in the surgical management of DRS patients.
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    The effect of sevoflurane anesthesia on the corneal endothel
    (Turgut Özal Tıp Merkezi Dergisi, 2017) Polat, Nihat; Özkan, Ahmet Selim; Gündüz, Abuzer; Ulucan, Pamuk Betul; Çolak, Cemil
    Aim: To evaluate the mean changes in corneal endothelial cells in eyes that operated under sevoflurane general anesthesia. Material and Methods: 32 eyes of 32 patients who had extraocular surgery under general anesthesia included in this prospective study. Cell density (CD), Coefficient of Variation (CV) and Hexagonality rate (Hex) specular microscopy results at before surgery and 1 week and 1 month after surgery were analyzed. Results: The mean age of the patients was 15 ± 10 (min 4- max 36). The mean operation time of the patients was 90 ± 15 minutes. The mean preoperative CD value of the study subjects was 3097±15 cell/mm2. The mean postoperative CD value was 3119±194 cell/mm2 at the 1.week and 3120±207 cell/mm2 at the 1.month (p=0.678). The mean preoperative CV was 0.27±0.4 while the postoperative 1. week value was 0.27±0.4, and the postoperative 1st month value was 0.27±0.5 (p=0.319). The mean preoperative Hex value of the study subjects was 53±10%. The mean postoperative Hex value was 54±11% at the 1.week and 55±10% at the 1.month (p=0.992). No significant difference was present between the periods in terms of CD, CV and Hex. Conclusion: There is no change in the corneal endothel in patients who suffered general anesthesia with sevoflurane. Keywords: General Anesthesia; Corneal Endothel; Sevoflurane.
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    The Effect of Sevoflurane Anesthesia on the Corneal Endothelium
    (2017) Polat, Nihat; Ozkan, Ahmet Selim; Gunduz, Abuzer; Ulucan, Pamuk Betul; Colak, Cemil
    Aim: To evaluate the mean changes in corneal endothelial cells in eyes that operated under sevoflurane general anesthesia.
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    Nontraumatic Descemet Membrane Detachment with Tear in Osteogenesis Imperfecta
    (Springer International Publishing Ag, 2015) Polat, Nihat; Ulucan, Pamuk Betul
    We report the first case of unilateral spontaneous Descemet membrane detachment (DMD) with tear occurring in a patient with osteogenesis imperfecta (OI). A 20-year-old male patient with OI presented with a history of recent primary repair (2 weeks prior) of left globe rupture following local finger trauma to the left eye. The patient had no history of other ocular surgery or trauma. The examination revealed a best corrected visual acuity of 20/40 in the right and no light perception in the left eye. Slit-lamp examination showed an oval giant Descemet tear extending from the 12 o'clock to the 5 o'clock area and a large DMD involving the upper and nasal quadrants in the right cornea. It was thought that monitoring the patient without intervention and only considering a surgical procedure if the disorder progressed was the best option, taking into account the patient's reasonable visual acuity and the risks of keratoplasty. The dimensions of the DMD and tear had remained the same at 1-year follow-up period. We believe that follow-up without intervention should be considered for non-progressive DMD with a giant tear if the patient has a single functional eye.