Yazar "Tunç Z." seçeneğine göre listele

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    Developments in accommodating intraocular lenses [Akomodatif Göz İçi Lenslerinde Gelişmeler]
    (2012) Tunç Z.
    Technical progress in cataract surgery has decreased the incidence of severe complications in this type of surgery. The introduction of micro incision cataract surgery (MICS) (sub- 2.0 mm incision) allow the surgeon to achieve better postoperative control of astigmatism and higherorder aberration (HOAs) with minimum induction of both. It is believed that multifocal lenses provide very successful results, however, there are limitations to these. Implantation of accommodating intraocular lenses (IOLs) is an option to treat presbyopia. The IOLs work by using the continued functionality of the ciliary muscle after cataract removal. Accommodating IOLs were designed to avoid the optical side effects of multifocal IOLs. Two main design concepts exist. First, axial shift concepts rely on anterior axial movement of one or two optics creating accommodative ability. Second, curvature change designs are designed to provide significant amplitudes of accommodation with little physical displacement. Accommodative IOLs to correct astigmatism and HOAs in the future are needed.
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    Early intraocular pressure spikes observed after selective laser trabeculoplasty treatment and risk factors [Selektif laser trabeküloplasti sonrası gözlenen erken dönem göz İçi basıncı artışı ve risk faktörleri]
    (Turkish Ophthalmology Society, 2014) Helvacıoğlu F.; Akıngöl Z.; Şencan S.; Tunç Z.
    Materials and Methods: Two hundred eyes of 100 patients who applied to the clinic between 01.11.2010 and 31.10.2011 and who had primary SLT treatment with the diagnosis of primary open-angle glaucoma or ocular hypertension were enrolled in the study. Patients’ demographic data, iris color, angle pigmentation, and angle degree measurements with goniolens, pachymetry measurements by optic coherence tomography (OCT), cup/disk measurements (by indirect ophthalmoscopy), and IOP measurements (by applanation tonometry) were noted. The relations between iris color, angle pigmentation, pachymetry and total energy with IOP spike and anterior chamber reactions observed at the 1st and 2nd hour of treatment were evaluated.Objectives: To analyze the IOP spikes after selective laser trabeculoplasty (SLT).Results: Thirty-seven percent of the patients were male and 63% of the patients were female. The mean age of males and females was 61.24±11.33 (33-85) and 58.21±12.35 (22-80), respectively. Mean IOP spikes and anterior chamber reactions at the 1st and 2nd hour of the treatment were 3.35 and 2.21 mmHg, respectively, and they were positively correlated (p=0.0001). As the eyes were examined according to iris color, statistically signifcant higher IOP spikes were observed in brown eyes (3.77 mmHg) than in green (2.62 mmHg) and hazel eyes (1.85 mmHg) (p=0.0001). No signifcant relationship was found between IOP spikes and pachymetry and total energy whereas positive correlation was observed between IOP spikes and angle pigmentation (p1=0.904, p2=0.823, p3=0.0001).Conclusion: IOP spikes seen after SLT treatment were observed more frequently in dark colored eyes or in eyes with heavily pigmented angles. We believe, the follow-up of these patients requires attention. © 2014 Turkish Ophthalmology Society. All rights reserved.
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    Multifocal progressive refractive diffractive lens: Optic design and clinical results [Multifokal progressif refraktif difraktif lens: Optik tasari{dotless}m ve klinik sonuçlari{dotless}]
    (2012) Tunç Z.; Helvacioglu F.; Şencan S.; Şimşek S.
    Purpose: To evaluate the visual functions of patients who had implantation of new-concept intraocular lens (IOL) OptiVis™, which has aspheric bifocal diffractive and progressive refractive design. Ma te ri al and Met hod: In this prospective study, 52 eyes of 27 patients had a new multifocal IOL OptiVis™ implantation through 2.5 mm incision after cataract surgery with phacoemulsification. 25 of the patients had simultaneous bilateral phacoemulsification with OptiVis™ IOL implantation. Two patients with different multifocal IOL previously implanted underwent monocular OptiVis™ implantation. Monocular distance, near and intermediate visual acuities and contrast sensitivity of the patients were recorded. Presence of glares and halo, frequency of spectacle use and patients' satisfaction were questioned. Re sults: The mean age of the patients was 71.10±10.60 years and the me an follow-up time was 20.35±13.99 months. The mean monocular uncorrected visual acuities of the patients were 0.96±0.11 (Snellen card in decimals) for distance, J1.07±0.26 (Jaeger card) for near (33 cm) and J2.25±0.55 for intermediate (60 cm) at 6 months after the operations. The mean best-corrected monocular visual acuities were 0.97±0.08, J1.05±0.23 and J2.23±0.54, respectively. The mean monocular contrast sensitivity of the patients under photic conditions were 47 in 1.5 cycles per degree (cpd), 73 in 3 cpd, 61 in 6 cpd, 17 in 12 cpd and 2 in 18 cpd. The halo and glare problems which were moderate at the first postoperative month, were mild or none in 20 patients (74.07%) and moderate in 7 patients (25.92%) at 3 months after the surgery. Only one patient (3.70%) sometimes needed glasses for far vision. Posterior capsule opacification was seen in 3 eyes (5.76%). Dis cus si on: OptiVis™, with its diffractive bifocal design, provided very good distance and near vision without any contrast loss. Additionally, this IOL provided considerably good intermediate vision with its progressive refractive design, thus resulted in high patient satisfaction.
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    Toxic anterior segment syndrome: Clinical and histopathological findings [Toksik anterior segment sendromu: Klinik ve histopatolojik bulgular]
    (2011) Tunç Z.; Arslan O.Ş.; Akingöl Z.; Ünal M.; Midi A.; Şencan S.
    Purpose: To analyze the clinical and histopathological findings of toxic anterior segment syndrome (TASS) which can be developed after phacoemulsification surgery. Material and Method: We evaluated the cases of three patients who developed TASS after uneventful phacoemulsification operations performed by the same surgeon in the same session. All patients were examined at the 1st, 12th, 24th, and 48th hours postoperatively. Further follow-up visits were planned as needed. Corneal decompensation developed in all three cases. One patient underwent evisceration and another one - penetrating keratoplasty. Both corneas were analyzed histopathologically. Results: The patients were between 61 and 73 years of age and all were male. Blurred vision without pain, limbus-tolimbus corneal edema and hypopyon were observed in all three cases. In each case, the iris was irregularly dilated and atrophic. Histopathological evaluation showed that the endothelial cell layer has disappeared completely in two corneas. The third case suffered loss of vision due to corneal decompensation and glaucoma refractory to medical treatment. Discussion: TASS is a serious complication, which can result in complete loss of corneal endothelial layer. It is important that switching to disposable instruments and/or adequate cleaning of the surgical instruments will reduce the TASS complication.