24 results on '"Voykov, Bogomil"'
Search Results
2. Results of XEN45 Gel Stent Implantation in the Treatment of Primary Open‐Angle Glaucoma Using 5, 10 or 20 μg Mitomycin C: A Pilot Study.
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Reichel, Felix F., Guggenberger, Vanessa, Faber, Hanna, Neubauer, Jonas, Voykov, Bogomil, and Mencía-Gutiérrez, Enrique
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GLAUCOMA surgery ,RESEARCH funding ,OPHTHALMIC drugs ,OCULAR hypertension ,PILOT projects ,INTRAOCULAR pressure ,PHARMACEUTICAL gels ,SURGICAL stents ,MITOMYCINS ,MINIMALLY invasive procedures ,TREATMENT effectiveness ,RETROSPECTIVE studies ,ANTIHYPERTENSIVE agents ,DESCRIPTIVE statistics ,DOSE-effect relationship in pharmacology ,MEDICAL records ,ACQUISITION of data ,OPHTHALMIC surgery - Abstract
Background: No consensus has been reached on the adequate dose of mitomycin C (MMC) in XEN45 gel stent implantation. Lower doses have the potential to reduce MMC‐linked side effects. This study aimed to evaluate treatment efficacy of ab interno XEN45 gel stent in primary open‐angle glaucoma (POAG) with three different MMC doses. Methods: This retrospective single‐centre nonrandomised trail included 54 patients (56 eyes) who underwent XEN45 gel stent implantation for POAG with above‐target intraocular pressure (IOP) under medical therapy. Eyes were grouped according to the received MMC dose: Group 1 (20 μg; n = 21), Group 2 (10 μg; n = 14) and Group 3 (5 μg; n = 21). The primary endpoint was the mean IOP change in the three MMC dose groups after 6, 12 and 24 months. Secondary endpoints included the success rate defined as lowering of baseline IOP ≥ 20% and below a cut‐off IOP set at three different levels: ≤ 18, ≤ 16 and ≤ 14 mmHg (Criteriums 1, 2 and 3), the mean number of ocular hypotensive medications and the frequency of needling procedures. Results: After 24 months, the overall mean (standard error) IOP was significantly reduced from 24.7 (0.9) mmHg to 15.2 (0.7) mmHg (p < 0.0001). The average IOP change (standard error) in MMC dose groups 1, 2 and 3 was −8.6 (2) mmHg, −10.1 (2.1) mmHg and −10.4 (2.8) mmHg. Complete success (Criterium 1) was achieved in 50%, 62% and 43% of the eyes in groups 1, 2 and 3. No statistically significant difference was found within the first 24 months between the three MMC dose groups for IOP change, success rate, number of ocular hypotensive medications and the frequency of needling procedures. Conclusions: XE45 was effective in all three dose groups. As the success rate did not significantly differ between the MMC doses, these results may support the use of the lowest dose. Trial Registration: ClinicalTrials.gov identifier: 559/2016BO2 [ABSTRACT FROM AUTHOR]
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- 2024
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3. Two-Year Results of XEN Gel Stent Implantation for Pseudoexfoliative Glaucoma in Phakic versus Pseudophakic Eyes.
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Nasyrov, Emil, Merle, David A., Gassel, Caroline J., Wenzel, Daniel A., and Voykov, Bogomil
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MINIMALLY invasive procedures ,INTRAOCULAR pressure ,LOG-rank test ,GLAUCOMA ,PHACOEMULSIFICATION - Abstract
Objectives: To investigate whether phakia affects the outcome of XEN-45 gel stent implantation in the treatment of pseudoexfoliative glaucoma (PXG). Methods: A retrospective, comparative cohort study of 30 phakic and 55 pseudophakic PXG patients who received the XEN-45 gel stent at a tertiary centre. The primary outcome measure was two-year success defined as a ≥20% lowering of intraocular pressure (IOP) and a target IOP of 6–21 mmHg. Success was complete without and qualified irrespective of antiglaucoma medication use. Further glaucoma surgery other than needling was regarded as a failure. The secondary outcome measures included changes in IOP, revision and complication rates. Results: The complete two-year success rates were 70% and 59% in the phakic and pseudophakic groups, respectively (p = 0.75, log-rank test), and the qualified rates were 80% and 72%, respectively (p = 0.89). The median IOP reduction from baseline was 54% in phakic, and 46% in pseudophakic eyes. While needling rates were similar, the incidence of early incisional bleb revisions was significantly higher in the phakic eyes (13% vs. 0% within 3 months; p = 0.0098, chi-square). Increasing after a year, significantly more pseudophakic eyes failed due to secondary glaucoma surgery (16% vs. 0%; p = 0.0191). Conclusions: The XEN-45 gel stent offers equally effective IOP control for both phakic and pseudophakic patients. However, the onset of bleb revisions and the necessity for secondary glaucoma surgery differed significantly between the groups. [ABSTRACT FROM AUTHOR]
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- 2024
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4. New XEN63 Gel Stent Implantation in Open-Angle Glaucoma: A Two-Year Follow-Up Pilot Study
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Voykov, Bogomil, primary, Nasyrov, Emil, additional, Neubauer, Jonas, additional, and Gassel, Caroline J, additional
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- 2023
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5. New XEN63 Gel Stent Implantation in Open-Angle Glaucoma: A Two-Year Follow-Up Pilot Study
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Voykov,Bogomil, Nasyrov,Emil, Neubauer,Jonas, Gassel,Caroline J, Voykov,Bogomil, Nasyrov,Emil, Neubauer,Jonas, and Gassel,Caroline J
- Abstract
Bogomil Voykov, Emil Nasyrov, Jonas Neubauer, Caroline J Gassel Centre for Ophthalmology, University Hospital Tuebingen, Tuebingen, GermanyCorrespondence: Bogomil Voykov, Centre for Ophthalmology, University Hospital Tuebingen, Elfriede-Aulhorn-Str. 7, Tuebingen, 72076, Germany, Tel +49 7071 2988088, Fax +49 7071 295455, Email bogomil.voykov@med.uni-tuebingen.dePurpose: The XEN gel stent was developed to reduce the risks of filtration surgery by standardizing the outflow of aqueous humor into the subconjunctival space. Recently, a modified version of the XEN63 gel stent was introduced. The goal of this study was to assess its efficacy and safety.Methods: This is a prospective, nonrandomized, observational, consecutive case series study at a single tertiary centre. Patients with open-angle glaucoma with above target intraocular pressure (IOP) despite maximal tolerated medication were included. The primary outcome was a change of median IOP. Secondary outcomes included a change in the number of medications, complete success, needling and complication rates. Success was defined as a lowering of IOP > 20% from baseline and IOP ⤠14 mmHg. Complete success indicated that the target IOP was reached without medications.Results: Six patients were included. The median IOP decreased from 35.5 mmHg (25.0â 40.0 mmHg) at baseline to 11.5 mmHg (4.0â 15.0 mmHg, p = 0.03), and median IOP-lowering medication was reduced from 4.0 (3.0â 4.0) at baseline to 0 (0â 1.0, p = 0.03) after two years. Five patients (83.0%) had a complete success after two years. Two patients (33.0%) required a needling procedure. Three patients (50.0%) required an intervention due to symptomatic hypotony within the first three weeks postoperatively. Hypotony resolved completely or was asymptomatic after three months.Conclusion: Our study demonstrated a statistically significant reduction in both IOP and number of IOP-lowering medications. Complications were well manageable and had no long-term seq
- Published
- 2023
6. Detailed intraocular pressure curve by telemetric tonometry with an implanted pressure sensor before and after PreserFlo® MicroShunt implantation: a case report
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Gassel, Caroline Julia, primary, Dzhelebov, Dimitar Nikolov, additional, and Voykov, Bogomil, additional
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- 2023
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7. Vessel Evaluation in Patients with Primary Open-Angle Glaucoma, Normal Tension Glaucoma and Healthy Controls
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Kortuem, Constanze, Dietter, Johannes, Bozkurt, Yagmur, Kortuem, Friederike Charlotte, Abaza, Annegret, Wahl, Siegfried, Ivanov, Iliya V, Ueffing, Marius, and Voykov, Bogomil
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AVR ,genetic structures ,CRVE ,Clinical Ophthalmology ,sense organs ,fractal dimensions ,CRAE ,eye diseases ,Original Research ,tortuosity of vessels - Abstract
Constanze Kortuem,1,* Johannes Dietter,2,* Yagmur Bozkurt,2 Friederike Charlotte Kortuem,1 Annegret Abaza,1 Siegfried Wahl,2,3 Iliya V Ivanov,2,3 Marius Ueffing,2 Bogomil Voykov1 1Department of Ophthalmology, University Eye Hospital, Eberhard Karls University Tuebingen, Tuebingen, Germany; 2Department of Ophthalmology, Institute for Ophthalmic Research University of Tuebingen, Tuebingen, Germany; 3Carl Zeiss Vision International GmbH, Aalen, Germany*These authors contributed equally to this workCorrespondence: Constanze KortuemDepartment of Ophthalmology, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Str. 7, Tuebingen, 72076, GermanyTel +49 7071 29-88687Fax +49 7071 293749Email Constanze.kortuem@med.uni-tuebingen.dePurpose: To compare changes in central retinal arterial equivalent (CRAE), central retinal vein equivalent (CRVE), arteriovenous ratio (AVR), tortuosity and fractal dimension in primary open-angle glaucoma (POAG), normal-tension glaucoma (NTG) and in a control group (CG) on fundus photographs. Further, to provide further evidence of vascular change in glaucoma patients using a novel method of tortuosity.Patients and Methods: The primary endpoint was the change in CRAE, CRVE, AVR, fractal dimension and tortuosity of the retinal vasculature from baseline, retrospectively analyzed from 2011 to 2017 at the University Eye Hospital Tuebingen. Fundus photos of POAG (N = 49), NTG (N = 38) and CG (N = 18) were computer evaluated and analyzed in the quantities mentioned above.Results: CRAE in NTG and POAG and CRVE in NTG significantly decreased (P = 0.02, P = 0.01; P = 0.03) whereas CRVE in POAG increased insignificantly (P = 0.72). In NTG, AVR decreased significantly (P = 0.05), but to a lesser extent than in POAG (P < 0.001). In CG, CRAE decreased insignificantly (P = 0.10), CRVE decreased significantly (P = 0.03) and AVR increased insignificantly (P = 0.77). In POAG tortuosity calculated using standard methods as well as our novel method, increased significantly (P = 0.015â 0.04), whereas it did not occur in NTG (P = 0.18â 0.57) and CG (P = 0.11â 0.21). Fractal dimensions in POAG decreased significantly (P = 0.001â 0.002), whereas in NTG and CG changes were insignificant (P = 0.33â 0.92).Conclusion: Based on a retrospective analysis of fundus photographs, specific retinal vasculature features of the retinal vasculature display significant alterations associated with NTG and POAG. The assessment of tortuosity using our novel method was consistent with previously established methods for analyzing tortuosity.Keywords: AVR, CRAE, CRVE, tortuosity of vessels, fractal dimensions
- Published
- 2021
8. Detailed intraocular pressure curve by telemetric tonometry with an implanted pressure sensor before and after PreserFlo ® MicroShunt implantation: a case report.
- Author
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Gassel, Caroline Julia, Dzhelebov, Dimitar Nikolov, and Voykov, Bogomil
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PROSTHETICS ,ACETAZOLAMIDE ,INTRAOCULAR pressure ,GLAUCOMA ,MINIMALLY invasive procedures ,DEXAMETHASONE ,ARTIFICIAL implants ,CATARACT surgery ,OPTICAL coherence tomography ,TONOMETRY ,EYE examination - Abstract
Continuous control of intraocular pressure (IOP) is crucial to preventing long-term damage to the optic nerve in glaucoma. Recently, a novel telemetric IOP sensor (EYEMATE-IO™, Implandata Ophthalmic Products GmbH, Hannover, Germany) has been developed that continuously records IOP. The patient can read the IOP measurements wirelessly using a hand-held reading device. We present the case of a 70-year-old patient with primary open-angle glaucoma who had been implanted with an EYEMATE-IO™ and recently underwent minimally invasive bleb-filtering surgery with the PreserFlo
® MicroShunt (Santen, Osaka, Japan). This case demonstrates both the benefits of continuous pressure measurement with EYEMATE-IO™ and the ability of the PreserFlo® MicroShunt to significantly reduce IOP fluctuations. [ABSTRACT FROM AUTHOR]- Published
- 2023
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9. Vessel Evaluation in Patients with Primary Open-Angle Glaucoma, Normal Tension Glaucoma and Healthy Controls
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Kortuem,Constanze, Dietter,Johannes, Bozkurt,Yagmur, Kortuem,Friederike Charlotte, Abaza,Annegret, Wahl,Siegfried, Ivanov,Iliya V, Ueffing,Marius, Voykov,Bogomil, Kortuem,Constanze, Dietter,Johannes, Bozkurt,Yagmur, Kortuem,Friederike Charlotte, Abaza,Annegret, Wahl,Siegfried, Ivanov,Iliya V, Ueffing,Marius, and Voykov,Bogomil
- Abstract
Constanze Kortuem,1,* Johannes Dietter,2,* Yagmur Bozkurt,2 Friederike Charlotte Kortuem,1 Annegret Abaza,1 Siegfried Wahl,2,3 Iliya V Ivanov,2,3 Marius Ueffing,2 Bogomil Voykov1 1Department of Ophthalmology, University Eye Hospital, Eberhard Karls University Tuebingen, Tuebingen, Germany; 2Department of Ophthalmology, Institute for Ophthalmic Research University of Tuebingen, Tuebingen, Germany; 3Carl Zeiss Vision International GmbH, Aalen, Germany*These authors contributed equally to this workCorrespondence: Constanze KortuemDepartment of Ophthalmology, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Str. 7, Tuebingen, 72076, GermanyTel +49 7071 29-88687Fax +49 7071 293749Email Constanze.kortuem@med.uni-tuebingen.dePurpose: To compare changes in central retinal arterial equivalent (CRAE), central retinal vein equivalent (CRVE), arteriovenous ratio (AVR), tortuosity and fractal dimension in primary open-angle glaucoma (POAG), normal-tension glaucoma (NTG) and in a control group (CG) on fundus photographs. Further, to provide further evidence of vascular change in glaucoma patients using a novel method of tortuosity.Patients and Methods: The primary endpoint was the change in CRAE, CRVE, AVR, fractal dimension and tortuosity of the retinal vasculature from baseline, retrospectively analyzed from 2011 to 2017 at the University Eye Hospital Tuebingen. Fundus photos of POAG (N = 49), NTG (N = 38) and CG (N = 18) were computer evaluated and analyzed in the quantities mentioned above.Results: CRAE in NTG and POAG and CRVE in NTG significantly decreased (P = 0.02, P = 0.01; P = 0.03) whereas CRVE in POAG increased insignificantly (P = 0.72). In NTG, AVR decreased significantly (P = 0.05), but to a lesser extent than in POAG (P < 0.001). In CG, CRAE decreased insignificantly (P = 0.10), CRVE decreased significantly (P = 0.03) and AVR increased insignificantly (P = 0.77). In POAG tortuosity calculated using standard methods as well as our no
- Published
- 2021
10. Comparison of ab externo trabeculotomy in primary open-angle glaucoma and uveitic glaucoma: long-term outcomes
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William, Antony, Spitzer, Martin S, Doycheva, Deshka, Dimopoulos, Spyridon, Leitritz, Martin Alexander, and Voykov, Bogomil
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primary open-angle glaucoma ,genetic structures ,Clinical Ophthalmology ,sense organs ,ab externo trabeculotomy ,uveitic glaucoma ,eye diseases ,Original Research - Abstract
Antony William, Martin S Spitzer, Deshka Doycheva, Spyridon Dimopoulos, Martin Alexander Leitritz, Bogomil Voykov Centre for Ophthalmology, University Hospital Tübingen, Tübingen, Germany Background: The aim of this study was to compare the long-term outcomes of ab externo trabeculotomy in primary open-angle glaucoma (POAG) and uveitic glaucoma (UG). Design: This was a retrospective single-center case series study. Participants: Twenty eyes of 17 patients with POAG and 22 eyes of 18 patients with UG were included in this study. Patients and methods: The medical records of all consecutive patients with POAG and UG who underwent ab externo trabeculotomy since 2004 were reviewed. Main outcome measure: The main outcome measure was change in median intraocular pressure (IOP). Success was defined as IOP ≤21mmHg (success 1) and IOP ≤21mmHg and at least 25% reduction from baseline (success 2). Results: In the POAG group, the median IOP decreased significantly from 22mmHg (95% CI 21–25mmHg; n=20) at baseline to 14mmHg (95% CI 12–16; n=13) after 4years, P
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- 2016
11. First-in-human phase I study of ISTH0036, an antisense oligonucleotide selectively targeting transforming growth factor beta 2 (TGF-β2), in subjects with open-angle glaucoma undergoing glaucoma filtration surgery
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Pfeiffer, Norbert, primary, Voykov, Bogomil, additional, Renieri, Giulia, additional, Bell, Katharina, additional, Richter, Paul, additional, Weigel, Melanie, additional, Thieme, Hagen, additional, Wilhelm, Barbara, additional, Lorenz, Katrin, additional, Feindor, Martin, additional, Wosikowski, Katja, additional, Janicot, Michel, additional, Päckert, Daniela, additional, Römmich, Regina, additional, Mala, Carola, additional, Fettes, Petra, additional, and Leo, Eugen, additional
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- 2017
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12. Comparison of ab externo trabeculotomy in primary open-angle glaucoma and uveitic glaucoma: long-term outcomes
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William,Antony, Spitzer,Martin, Doycheva,Deshka, Dimopoulos,Spyridon, Leitritz,Martin, Voykov,Bogomil, William,Antony, Spitzer,Martin, Doycheva,Deshka, Dimopoulos,Spyridon, Leitritz,Martin, and Voykov,Bogomil
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Antony William, Martin S Spitzer, Deshka Doycheva, Spyridon Dimopoulos, Martin Alexander Leitritz, Bogomil Voykov Centre for Ophthalmology, University Hospital Tübingen, Tübingen, Germany Background: The aim of this study was to compare the long-term outcomes of ab externo trabeculotomy in primary open-angle glaucoma (POAG) and uveitic glaucoma (UG). Design: This was a retrospective single-center case series study. Participants: Twenty eyes of 17 patients with POAG and 22 eyes of 18 patients with UG were included in this study. Patients and methods: The medical records of all consecutive patients with POAG and UG who underwent ab externo trabeculotomy since 2004 were reviewed. Main outcome measure: The main outcome measure was change in median intraocular pressure (IOP). Success was defined as IOP ≤21 mmHg (success 1) and IOP ≤21 mmHg and at least 25% reduction from baseline (success 2). Results: In the POAG group, the median IOP decreased significantly from 22 mmHg (95% CI 21–25 mmHg; n=20) at baseline to 14 mmHg (95% CI 12–16; n=13) after 4 years, P<0.001. In the UG group, the median IOP decreased significantly from 27 mmHg (95% CI 24.5–30.5 mmHg; n=22) at baseline to 12 mmHg (95% CI 9–15 mmHg; n=15) after 4 years, P<0.001. Seven eyes in the UG group failed within the first year after surgery compared to none in the POAG group. Of these, four eyes had Fuchs’ uveitis syndrome and two had granulomatous uveitis. No sight-threatening complications occurred in both POAG and UG groups. Conclusion: Ab externo trabeculotomy effectively reduced IOP in both UG and POAG groups. However, the success rates in the UG group were significantly lower due to the high failure rate in patients with Fuchs’ uveitis syndrome and granulomatous uveitis. The procedure de
- Published
- 2016
13. Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study
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Leitritz, Martin, Ziemssen,Focke, Bartz-Schmidt,Karl Ulrich, and Voykov,Bogomil
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genetic structures ,Clinical Ophthalmology ,sense organs ,eye diseases - Abstract
Martin Alexander Leitritz, Focke Ziemssen, Karl Ulrich Bartz-Schmidt, Bogomil Voykov Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen, Germany Purpose: To evaluate a digital high-speed camera combined with digital morphometry software for dynamic measurements of phakic intraocular lens movements to observe kinetic influences, particularly in fast direction changes and at lateral end points. Materials and methods: A high-speed camera taking 300frames per second observed movements of eight iris-claw intraocular lenses and two angle-supported intraocular lenses. Standardized saccades were performed by the patients to trigger mass inertia with lens position changes. Freeze images with maximum deviation were used for digital software-based morphometry analysis with ImageJ.Results: Two eyes from each of five patients (median age 32 years, range 28–45 years) without findings other than refractive errors were included. The high-speed images showed sufficient usability for further morphometric processing. In the primary eye position, the median decentrations downward and in a lateral direction were -0.32mm (range -0.69to 0.024) and 0.175mm (range -0.37to 0.45), respectively. Despite the small sample size of asymptomatic patients, we found a considerable amount of lens dislocation. The median distance amplitude during eye movements was 0.158mm (range 0.02–0.84). There was a slight positive corrlation (r=0.39, P
- Published
- 2014
14. Comparison of ab externo trabeculotomy in primary open-angle glaucoma and uveitic glaucoma: long-term outcomes
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Voykov, Bogomil, primary, William, Antony, additional, Spitzer, Martin, additional, Doycheva, Deshka, additional, Dimopoulos, Spyridon, additional, and Leitritz, Martin, additional
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- 2016
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15. Anatomical and visual outcomes of autologous thrombocyte serum concentrate in the treatment of persistent full-thickness idiopathic macular hole after ILM peeling with brilliant blue G and membrane blue dual
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Dimopoulos, Spyridon, primary, William, Antony, additional, Voykov, Bogomil, additional, Ziemssen, Focke, additional, Bartz-Schmidt, Karl Ulrich, additional, and Spitzer, Martin S., additional
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- 2016
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16. Morphometric Optic Nerve Head Analysis in Glaucoma Patients: A Comparison between the Simultaneous Nonmydriatic Stereoscopic Fundus Camera (Kowa Nonmyd WX3D) and the Heidelberg Scanning Laser Ophthalmoscope (HRT III)
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Mariacher, Siegfried, primary, Hipp, Stephanie, additional, Wirthky, Robert, additional, Blumenstock, Gunnar, additional, Bartz-Schmidt, Karl-Ulrich, additional, Ziemssen, Focke, additional, Schiefer, Ulrich, additional, Voykov, Bogomil, additional, and Januschowski, Kai, additional
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- 2016
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17. Submacular predominantly hemorrhagic choroidal neovascularization: resolution of bleedings under anti-VEGF therapy
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Dimopoulos,Spyridon, Leitritz,Martin Alexander, Ziemssen,Focke, Voykov,Bogomil, Bartz-Schmidt,Karl Ulrich, Gelisken,Faik, Dimopoulos,Spyridon, Leitritz,Martin Alexander, Ziemssen,Focke, Voykov,Bogomil, Bartz-Schmidt,Karl Ulrich, and Gelisken,Faik
- Abstract
Spyridon Dimopoulos, Martin Alexander Leitritz, Focke Ziemssen, Bogomil Voykov, Karl Ulrich Bartz-Schmidt, Faik Gelisken Centre for Ophthalmology, Eberhard-Karls University, Tuebingen, Germany Purpose: To report the visual and morphological outcomes following intravitreal bevacizumab in neovascular age-related macular degeneration (nAMD) with submacular, predominantly hemorrhagic, lesions.Methods: Retrospective study of patients with a follow-up after 1 year. All eyes with submacular hemorrhages larger than 50% of the total lesion size and received only anti-VEGF (vascular endothelial growth factor) monotherapy (intravitreous administration of 1.25 mg bevacizumab, PRN). The primary endpoint was the change in hemorrhage size and time to resolution, in association with the mean best-corrected visual acuity (BCVA). The eyes were grouped based on the size of the hemorrhage: group A (≥1 to <4 disc area [DA]), group B (≥4 to <9 DA), and group C (≥9 DA).Results: Forty-six consecutive eyes were included. The mean area of the hemorrhage was 6 DA at baseline. Eyes with smaller bleeding (group A) had better chances of stabilized or improved vision. Complete resolution of the hemorrhage was seen in 96% of the eyes within 1 year. The mean BCVA increased from 0.81 logarithm of the minimum angle of resolution (logMAR) (95% confidence interval [CI]: 0.70–0.92) (Snellen 20/125) at baseline to 0.75 logMAR (95% CI: 0.62–0.88) (20/125) after 1 year (P=0.11). BCVA improved (one or more ETDRS [Early Treatment of Diabetic Retinopathy Study] lines) in 57% of the eyes (13/23) in group A; 53% (8/15) in group B; and 38% (3/8) in group C.Conclusion: Many of the eyes with hemorrhagic lesions showed stabilization or improvement of the mean BCVA after treatment within 1 year. Anti-VEGF treatment can be considered as a useful treatment option in eyes with hemorrhages secondary to nAMD. Keywords: age-related macular degeneration, bevac
- Published
- 2015
18. Submacular predominantly hemorrhagic choroidal neovascularization: resolution of bleedings under anti-VEGF therapy
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Dimopoulos, Spyridon, primary, Leitritz, Martin Alexander, additional, Ziemssen, Focke, additional, Voykov, Bogomil, additional, Bartz-Schmidt, Karl Ulrich, additional, and Gelisken, Faik, additional
- Published
- 2015
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19. Using a slit lamp-mounted digital high-speed camera for dynamic observation of phakic lenses during eye movements: a pilot study
- Author
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Leitritz,Martin Alexander, Ziemssen,Focke, Bartz-Schmidt,Karl Ulrich, Voykov,Bogomil, Leitritz,Martin Alexander, Ziemssen,Focke, Bartz-Schmidt,Karl Ulrich, and Voykov,Bogomil
- Abstract
Martin Alexander Leitritz, Focke Ziemssen, Karl Ulrich Bartz-Schmidt, Bogomil Voykov Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Tübingen, Germany Purpose: To evaluate a digital high-speed camera combined with digital morphometry software for dynamic measurements of phakic intraocular lens movements to observe kinetic influences, particularly in fast direction changes and at lateral end points. Materials and methods: A high-speed camera taking 300 frames per second observed movements of eight iris-claw intraocular lenses and two angle-supported intraocular lenses. Standardized saccades were performed by the patients to trigger mass inertia with lens position changes. Freeze images with maximum deviation were used for digital software-based morphometry analysis with ImageJ.Results: Two eyes from each of five patients (median age 32 years, range 28–45 years) without findings other than refractive errors were included. The high-speed images showed sufficient usability for further morphometric processing. In the primary eye position, the median decentrations downward and in a lateral direction were -0.32 mm (range -0.69 to 0.024) and 0.175 mm (range -0.37 to 0.45), respectively. Despite the small sample size of asymptomatic patients, we found a considerable amount of lens dislocation. The median distance amplitude during eye movements was 0.158 mm (range 0.02–0.84). There was a slight positive corrlation (r=0.39, P<0.001) between the grade of deviation in the primary position and the distance increase triggered by movements.Conclusion: With the use of a slit lamp-mounted high-speed camera system and morphometry software, observation and objective measurements of iris-claw intraocular lenses and angle-supported intraocular lenses movements seem to be possible. Slight decentration in the primary position might be an indicator of
- Published
- 2014
20. Visual field testing in Driver’s license assessment in Germany
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Voykov, Bogomil and Wilhelm, Helmut (Prof. Dr. med.)
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Gesichtsfeld , Fahrtüchtigkeit , Gesichtsfeldmessung ,Visual field , Driver's license assessment , Perimetry - Abstract
Ziel: Die Gesichtsfeldprüfung ist eine der Hauptkomponenten in der Fahrtauglichkeitsbegutachtung. Die Fahrerlaubnis-Verordnung und deren Änderungsverordnung (FeV und FeVÄndV) regeln u.a. auch diese Prüfung. Die FeVÄndV ist am 23.08.2002 in Kraft getreten und hat einige wichtige Änderungen gebracht. Als ein völlig neues Element wurde ein „verschärfter“ Sehtest für die Begutachtung der Fahrerlaubnisklassen C, C1, CE, C1E, D, D1, DE, D1E und der Fahrerlaubnis zur Fahrgastbeförderung, der für Ärzte mit der Gebietsbezeichnung „Arbeitsmedizin“, „Betriebsmedizin“, für Ärzte bei einer Begutachtungsstelle für Fahreignung, Ärzte des Gesundheitsamtes oder Ärzte der öffentlichen Verwaltung gedacht ist, eingeführt. Damit verbunden sind ein stark angestiegener Aufwand und eine Unsicherheit in diesen Berufsgruppen. Besonders problematisch sind die korrekte Prüfung und Auswertung des Gesichtsfeldes, da es hier auf „Normalität“ oder „normale Funktion“ geprüft werden muss, jedoch durch Ärzte mit kaum, wenn überhaupt, perimetrischer Erfahrung. Unser Ziel war es, einfache Kriterien in Form eines Algorithmus für die Diagnose „normales Gesichtsfeld der Kfz Fahrer“ zu entwickeln. Methoden: Für die Entwicklung unseres Algorithmus verwendeten wir insgesamt 3208 monokulare Gesichtsfelder von 1614 Probanden (20 einäugige Probanden inbegriffen). Unsere Daten stammen aus drei europäischen Zentren, die an der „Relevance of glare sensitivity and impairment of visual function among European drivers“ – Studie teilgenommen haben. Die Gesichtsfelduntersuchung erfolgte mittels automatisierter, statischer Perimetrie. Beide Augen wurden getrennt untersucht nach einer 3-Zonen alterskorrelierten Strategie, d.h. es gab insgesamt drei mögliche Antworten: a) normale Empfindlichkeit (LUE), b) reduzierte LUE (mehr als 6 dB im Vergleich zu einer alterskorrelierten Gruppe) und c) absoluter Ausfall (oder keine messbare LUE für den maximalen Lichtstimulus, den das Gerät produzieren kann). Es wurde ein Prüfpunktraster basierend auf das von Lachenmayr vorgeschlagene Modell ausgewählt. Die Zahl der geprüften Punkte lag zentrumspezifisch zwischen 96 und 101, ohne wesentliche Unterschiede in der Verteilung. Die für unseren Algorithmus verwendeten Untersuchungen erfolgten am Humphrey Perimeter. Alle Prüfpunkte wurden in fünf großen Zonen erfasst, vier periphere – superior, nasal, inferior und temporal, sowie eine zentrale – zentrale 30-Grad. Alle Ausfälle wurden dann gezählt und in sechs möglichen Gruppen zusammengestellt, dabei wurde zwischen absoluten und relativen Ausfällen nur in der zentrale-30-Grad-Zone unterschieden – vier „periphere“ Gruppen (superior, nasal, inferior, temporal) und zwei „zentrale“ Gruppen (30-Grad-absolut und 30-Grad-relativ). Unabhängig von dieser Einteilung der Ausfälle erfolgte eine gutachterliche Beurteilung aller Gesichtsfelder von zwei erfahrenen Augenärzten. Alle Gesichtsfelder wurden in vier möglichen Stufen klassifiziert in Bezug auf ihre Bedeutung für die Fahrtauglichkeit des jeweiligen Probanden. Der Stufe 1 wurden alle Gesichtsfelder, die die Gutachter als „normal“ oder „unauffällig“ bewerteten, zugeordnet. Die Stufe 2 enthält alle Gesichtsfelder, die als „wahrscheinlich normal“ oder „am ehesten normal“ beurteilt wurden. In der dritten Stufe (Stufe 3) wurden alle auffälligen Gesichtsfelder, die als „wahrscheinlich pathologisch“ oder „am ehesten pathologisch“ gesehen wurden, einbezogen. Die restlichen Gesichtsfelder, die als „pathologisch“ oder „auffällig“ bewertet wurden, unterteilten wir in der Stufe 4. Bei einem zweiten Modell wurde eine etwas gröbere Unterteilung in nur zwei Stufen vorgenommen. Hier wurden die Stufen 1 und 2 sowie die Stufen 3 und 4 zusammengelegt. Dementsprechend wurden zwei Modelle entwickelt – ein 2-Stufen- und ein 4-Stufen-Modell. In einem zweiten Schritt wurden die Algorithmen auf eine Serie von Gesichtsfeldern mit hoher Prävalenz der pathologischen Fälle getestet. Ergebnisse: Es wurden zwei Algorithmen entwickelt, entsprechend den zwei Modellen. Ein modifizierter Algorithmus wurde zur Unterscheidung zwischen „normalen“ und „pathologischen“ Fällen entwickelt. Schlussfolgerung: Die Diagnose eines „normalen“ Gesichtsfeldes ist eine der schwierigsten in der augenärztlichen, gutachterlichen Praxis überhaupt. Es ist trotzdem gelungen einen einfachen Algorithmus zu entwickeln, der für die Unterscheidung zwischen „normal“ und „pathologisch“ in der Gesichstfeldprüfung in Rahmen der Fahrtauglichkeitbegutachtung eine erhebliche Hilfe sein kann. Wenn in einem konventionellen Perimeter integriert, wird es auch für nicht-Augenärzte eine genauere Entscheidung, wann ein Gesichtsfeld kontrollbedürftig ist, möglich sein. Introduction: The new traffic legislation in Germany (“FeVÄndV”) solved some of the problems for the ophthalmological driver’s license assessment. However, there are several new features included that present a considerable problem concerning the visual field testing. The new legislation allows not only ophthalmologists but occupational health practitioners as well to perform visual field testing for the driver’s license assessment. Since the occupational health practitioners lack experience with this kind of testing, consideration should be made as to present criteria that would allow even an inexperienced person to perform the test reliably. Goal of this study was to create a simple algorithm that could be used by an occupational health practitioner in visual field testing in the driver’s license assessment. Methods: 3208 visual fields from 1608 test persons were used in this study. Data derived from „Relevance of glare sensitivity and impairment of visual function among European drivers“-Study, performed in 5 European cities between 2003 and 2004. All test persons underwent a standard automated perimetry on Humphrey Field Analyser in accordance to the grid proposed by Lachenmayr. Every visual field was then divided in 5 areas: superior, nasal, inferior, temporal and central. All visual field defects were counted and assessed in 6 groups according to these 5 areas (the central area was subdivided into relative and absolute defects). Two experienced ophthalmologists performed a masked assessment of all visual fields and divided them in 4 categories: “normal”, “probably normal”, “probably pathologic” and “pathologic”. Statistic software was used to create the algorithms. Results: Two algorithms were created. They were tested on a sample of visual fields with a high prevalence of pathological defects. A modified algorithm was then created. Conclusion: To diagnose a “normal” visual field is one of the most challenging tasks in the assessment of perimetry results. Nevertheless, we demonstrate that an algorithm can be created, that can facilitate this decision. To implement this algorithm in a perimeter in order to allow not-ophthalmologists to perform visual field testing in the driver’s license assessment would be the next logical step.
- Published
- 2008
21. Immunoglobulin E-Mediated Anaphylaxis to Sesame
- Author
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Guenova, Emmanuella, primary, Genova, Sonya, additional, Voykov, Bogomil, additional, Novakova, Silvia, additional, and Mitev, Vanyo, additional
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- 2008
- Full Text
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22. Anatomical and visual outcomes of autologous thrombocyte serum concentrate in the treatment of persistent full-thickness idiopathic macular hole after ILM peeling with brilliant blue G and membrane blue dual.
- Author
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Dimopoulos, Spyridon, William, Antony, Voykov, Bogomil, Ziemssen, Focke, Bartz ‐ Schmidt, Karl Ulrich, and Spitzer, Martin S.
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TREATMENT of eye diseases ,EYE diseases ,RETINAL diseases ,PARS plana ,VITRECTOMY ,PATIENTS - Abstract
The article focuses on a study based on anatomical and visual outcomes of autologous thrombocyte serum concentrate in the treatment of persistent idiopathic full-thickness macular holes (FTMH). It mentions pars plana vitrectomy with gas tamponade with peeling of the inner limiting membrane (ILM) has become famous procedure for the treatment of FTMH. It also mentions performing of vitrectomy with ILM peeling surgery for idiopathic FTMH.
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- 2017
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23. Outcomes of Ab-externo Trabeculotomy in the Treatment of Primary Open Angle and Uveitis Glaucoma and outcomes of Primary ATransconjunctival 23-Gauge Vitrectomy in the Diagnosis and Treatment of Presumed Endogenous Fungal Endophthalmitis
- Author
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William, Antony and Voykov, Bogomil (PD Dr.)
- Subjects
Glaucoma - Abstract
Ein Hauptvorteil der ab externo Trabekulotomie ist, dass sie den Abfluss erleichtert und den physiologischen Pfad des Kammerwassers wiederherstellt, ohne die Notwendigkeit einer externen Fistulation. Somit können die mit einem Filterkisssen assoziierten Risiken vermieden werden. In unseren zwei Studien konnten wir zeigen, dass die ab externo Tabekulotomie einen mäßigen Erfolg in der Behandlung des POAG und des UG erzielen kann. Insbesondere in der UG Gruppe war die Erfolgsrate deutlich geringer als im der POAG Gruppe. Die ersten drei Monate nach der Operation waren entscheidend über den Behandlungserfolg. Die jungen Patienten mit FUS oder granulomatöser Uveitis profitierten am wenigsten von dem Eingriff. Deshalb ist die ab externo Trabekulotomie für diese Patientengruppen eher ungeeignet. Unsere Studie konnte außerdem zeigen, dass die Trabekulotomie in Kombination mit drucksenkender Medikation oder mit einem zyklodestruktiven Verfahren die Erfolgsraten erhöhen kann. Das Verfahren zeigte ein hohes Sicherheitsprofil, sowohl in der UG als auch in der POAG. Bei Verdacht auf endogene Pilz Endophthalmitiden kann durch eine diagnostische 23G Vitrektomie der Erreger bei der Mehrheit der betroffenen Patienten nachgewiesen werden. Candida Species waren erwartungsgemäß die am häufigsten nachgewiesenen Erreger für die endogenen Pilz Endophthalmitiden.
- Published
- 2022
24. Results of XEN45 Gel Stent Implantation in the Treatment of Primary Open-Angle Glaucoma Using 5, 10 or 20 μ g Mitomycin C: A Pilot Study.
- Author
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Reichel FF, Guggenberger V, Faber H, Neubauer J, and Voykov B
- Abstract
Background: No consensus has been reached on the adequate dose of mitomycin C (MMC) in XEN45 gel stent implantation. Lower doses have the potential to reduce MMC-linked side effects. This study aimed to evaluate treatment efficacy of ab interno XEN45 gel stent in primary open-angle glaucoma (POAG) with three different MMC doses. Methods: This retrospective single-centre nonrandomised trail included 54 patients (56 eyes) who underwent XEN45 gel stent implantation for POAG with above-target intraocular pressure (IOP) under medical therapy. Eyes were grouped according to the received MMC dose: Group 1 (20 μ g; n = 21), Group 2 (10 μ g; n = 14) and Group 3 (5 μ g; n = 21). The primary endpoint was the mean IOP change in the three MMC dose groups after 6, 12 and 24 months. Secondary endpoints included the success rate defined as lowering of baseline IOP ≥ 20% and below a cut-off IOP set at three different levels: ≤ 18, ≤ 16 and ≤ 14 mmHg (Criteriums 1, 2 and 3), the mean number of ocular hypotensive medications and the frequency of needling procedures. Results: After 24 months, the overall mean (standard error) IOP was significantly reduced from 24.7 (0.9) mmHg to 15.2 (0.7) mmHg ( p < 0.0001). The average IOP change (standard error) in MMC dose groups 1, 2 and 3 was -8.6 (2) mmHg, -10.1 (2.1) mmHg and -10.4 (2.8) mmHg. Complete success (Criterium 1) was achieved in 50%, 62% and 43% of the eyes in groups 1, 2 and 3. No statistically significant difference was found within the first 24 months between the three MMC dose groups for IOP change, success rate, number of ocular hypotensive medications and the frequency of needling procedures. Conclusions: XE45 was effective in all three dose groups. As the success rate did not significantly differ between the MMC doses, these results may support the use of the lowest dose. Trial Registration: ClinicalTrials.gov identifier: 559/2016BO2., Competing Interests: B. Voykov received honoraria from Allergan, Santen and Novartis for talks. V. Guggenberger received a travel grant from Santen. H. Faber received a travel grant from Novartis., (Copyright © 2024 Felix F. Reichel et al.)
- Published
- 2024
- Full Text
- View/download PDF
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