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6 results on '"Tibor Karl Lohmann"'

1. Slow Cone Reflectance Changes during Bleaching Determined by Adaptive Optics Scanning Laser Ophthalmoscope in Living Human Eyes.

Author

Masakazu Hirota, Suguru Miyagawa, Hiroyuki Kanda, Takao Endo, Tibor Karl Lohmann, Tomomitsu Miyoshi, Takeshi Morimoto, and Takashi Fujikado

Subjects
Medicine, Science
Abstract

To investigate the changes in the reflectance of human cone photoreceptors by an adaptive optics scanning laser ophthalmoscope (AO-SLO) during photobleaching. A custom-built AO-SLO with an observation light of 840-nm was used to measure the cone densities and the reflectance changes during bleaching by 630 nm red light emitting diodes. Measurements were made at 1° and 3° temporal to the fovea within an area of 1° × 1° in 8 eyes of 8 normal subjects. After dark-adaptation, images of the cone mosaics were recorded continuously for 5-min before, 5-min during, and after 5-min of light stimulation with a sampling rate of 5-Hz. The first positive peak (P1) was observed at 72.2 ± 15.0-s and a second positive peak (P2) at 257.5 ± 34.5-s at 1°. The increase of the reflectance of P1 was significantly larger at 1° (34.4 ± 13.9%) than at 3° (26.0 ± 10.5%; P = 0.03, Wilcoxon's signed rank test). The average cone density at 1° (51123.13 ± 1401.23 cells/mm2) was significantly larger than that at 3° (30876.13 ± 1459.28 cells/mm2; P

Published
2015
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2. New epiretinal implant with integrated sensor chips for optical capturing shows a good biocompatibility profile in vitro and in vivo

Author

Tibor Karl Lohmann, Kim Schaffrath, Rainer Kokozinski, Reinhard Viga, Wilfried Mokwa, Florian Waschkowski, Claudia Ingensiep, Pascal Raffelberg, Peter Walter, Sandra Johnen, Jan Seifert, and Publica

Subjects
Retinal stimulation, medicine.medical_specialty, Biocompatibility, OPTO-EPIRET, medicine.medical_treatment, Medizin, Biomedical Engineering, Vitrectomy, Retinal ganglion, Retina, Prosthesis Implantation, Biomaterials, chemistry.chemical_compound, In vivo, Ophthalmology, Retinitis pigmentosa, Medical technology, medicine, Animals, Radiology, Nuclear Medicine and imaging, R855-855.5, Elektrotechnik, Radiological and Ultrasound Technology, business.industry, Research, Retinal, General Medicine, medicine.disease, eye diseases, Electrodes, Implanted, Visual Prosthesis, Epiretinal implant, medicine.anatomical_structure, Vitreoretinal surgery, chemistry, Rabbits, Retinal prosthesis, Implant, business, Retinitis Pigmentosa
Abstract

Biomedical engineering online 20(1), 102 (2021). doi:10.1186/s12938-021-00938-9, Published by BioMed Central, London

Published
2021
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3. Effects of uncomplicated Descemet membrane endothelial keratoplasty on the central retinal thickness

Author

Niklas Plange, Matthias Fuest, Tibor Karl Lohmann, Sabine Baumgarten, and Peter Walter

Subjects
medicine.medical_specialty, Visual acuity, genetic structures, Fuchs Endothelial Dystrophy, Visual Acuity, Cell Count, Cornea, Cellular and Molecular Neuroscience, chemistry.chemical_compound, Optical coherence tomography, Descemet membrane endothelial keratoplasty, Ophthalmology, medicine, Humans, Macular edema, Descemet Membrane, Retrospective Studies, medicine.diagnostic_test, business.industry, Incidence (epidemiology), Endothelium, Corneal, Fuchs' Endothelial Dystrophy, Retrospective cohort study, Retinal, Lamellar corneal surgery, medicine.disease, Sensory Systems, eye diseases, chemistry, Bullous keratopathy, sense organs, medicine.symptom, business, Retinal thickness, Descemet Stripping Endothelial Keratoplasty
Abstract

Graefe's archive for clinical and experimental ophthalmology 259(9), 2731-2741 (2021). doi:10.1007/s00417-021-05203-2, Published by Springer, Berlin ; Heidelberg

Published
2021
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4. The very large electrode array for retinal stimulation (VLARS)—A concept study

Author

Florian Waschkowski, Thomas Laube, Kim Schaffrath, Cláudia Werner, Florent Haiss, Norbert Bornfeld, Anne-Christine Schnitzler, Gernot F. Rößler, Wilfried Mokwa, Sandra Johnen, Claudia S Barz, Tibor Karl Lohmann, Anna-Marina van der Meer, Peter Walter, Babak Mazinani, RWTH Aachen University, Dynamique corticale et prise de décision - Neural circuit dynamics and decision making, Institut Pasteur [Paris], Jülich Research Centre, Universität Duisburg-Essen [Essen], The VLARS project was supported with a grant from the Jackstädt Foundation and with additional funding from the Hans Lamers Foundation., The authors thank Claudia Werner for her outstanding technical support. Rudolph Pivik supported the VLARS team with the rotational stereotactic frame., Rheinisch-Westfälische Technische Hochschule Aachen University (RWTH), Institut Pasteur [Paris] (IP), and Universität Duisburg-Essen = University of Duisburg-Essen [Essen]

Subjects
MESH: Microelectrodes, genetic structures, multielectrode array, Swine, Medizin, MESH: Rabbits, Biocompatible Materials, Stimulation, 02 engineering and technology, chemistry.chemical_compound, 0302 clinical medicine, MESH: Biocompatible Materials, MESH: Animals, MESH: Swine, Visual Cortex, local eld potentials, MESH: Retina, cortical activation, Retinal detachment, MESH: Follow-Up Studies, Electrodes, Implanted, Retinal Tear, [SDV.IB]Life Sciences [q-bio]/Bioengineering, Rabbits, medicine.medical_specialty, 0206 medical engineering, Retinal implant, Biomedical Engineering, retina implant, MESH: Prosthesis Implantation, Retina, Prosthesis Implantation, 03 medical and health sciences, Cellular and Molecular Neuroscience, biocompatibility, Ophthalmology, Retinitis pigmentosa, medicine, Electrode array, Animals, ddc:610, business.industry, MESH: Visual Cortex, Retinal, medicine.disease, retinal stimulation, 020601 biomedical engineering, vitreoretinal surgery, eye diseases, chemistry, MESH: Electrodes, Implanted, Implant, sense organs, business, Microelectrodes, 030217 neurology & neurosurgery, Follow-Up Studies
Abstract

Journal of neural engineering 16(6), 066031 (2019). doi:10.1088/1741-2552/ab4113, Published by Institute of Physics Publishing, Bristol

Published
2019
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6. Development of very large electrode arrays for epiretinal stimulation (VLARS)

Author

Peter Walter, Gernot Roessler, Claudia Brockmann, Gabriele Thumann, Florian Waschkowski, Thomas Laube, Wilfried Mokwa, Tibor Karl Lohmann, Norbert Bornfeld, Sandra Johnen, Anne Christine Rieck, and Stephan Hesse

Subjects
genetic structures, Medizin, Blindness, Iridium, chemistry.chemical_compound, Artificial vision, Radiological and Ultrasound Technology, Rehabilitation, Retina/pathology, General Medicine, Equipment Design, Visual field, Silicon wafer Technology, Electrodes, Implanted, Retinitis pigmentosa, medicine.anatomical_structure, Gold/chemistry, Vitreoretinal surgery, Imides/chemistry, Polyimide, Materials science, Retinal implant, Biomedical Engineering, Electric Stimulation Therapy, Substrate (printing), Imides, Iridium/chemistry, Retina, Electric Stimulation Therapy/methods, Biomaterials, medicine, Humans, Radiology, Nuclear Medicine and imaging, Computer Simulation, Neurostimulation, Research, Retinal, medicine.disease, eye diseases, ddc:616.8, chemistry, Human eye, Implant, Retinal prosthesis, Gold, sense organs, Retinitis Pigmentosa/therapy, Biomedical engineering
Abstract

Biomedical engineering online 13, 11 (2014). doi:10.1186/1475-925X-13-11, Published by BioMed Central, London

Published
2014
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