The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Martin Uram - One of the best experts on this subject based on the ideXlab platform.
-
Ophthalmic Laser microendoscope endophotocoagulation
Ophthalmology, 1992Co-Authors: Martin UramAbstract:Purpose: The purpose of this article is to describe the function of the Ophthalmic Laser microendoscope as it pertains to endophotocoagulation in the management of vitreoretinal disease. Methods: Fifty-four consecutive vitrectomies with endophotocoagulation were performed using the Ophthalmic Laser microendoscope instead of endoillumination and endophotocoagulation probes. Intraoperative and postoperative efficacy and complications were evaluated. Results: The Ophthalmic Laser microendoscope was used to illuminate and view the retina and to deliver diode Laser energy in the management of posterior retinal breaks, proliferative retinopathies, and proliferative vitreoretinopathy. The technique of endophotocoagulation was similar to that used routinely in vitreoretinal surgery. The photocoagulation lesions that were created were identical to those delivered by standard endophotocoagulation probes. Intraoperative complications were few, consisting of transient mild retinal or choroidal hemorrhages. Severe postoperative complications related to endophotocoagulation or to use of the Ophthalmic Laser microendoscope were not observed. Conclusion: The Ophthalmic Laser microendoscope appears to be a safe and effective method of delivering diode Laser energy to the retina while simultaneously providing illumination, video recording, and a clear endoscopic view despite anterior segment conditions that might otherwise preclude adequate visualization and treatment. Fewer instrument insertions/removals were required for endophotocoagulation. Post-treatment search for peripheral iatrogenic retinal breaks was accomplished by endoscopy.
-
Ophthalmic Laser microendoscope ciliary process ablation in the management of neovascular glaucoma.
Ophthalmology, 1992Co-Authors: Martin UramAbstract:Purpose: To evaluate the potential efficacy of Ophthalmic Laser microendoscope photocoagulation of the ciliary processes in the management of intractable neovascular glaucoma. Methods: Ten patients with intractable neovascular glaucoma underwent Ophthalmic Laser microendoscope ciliary process ablation via a pars plana incision. The device and surgical technique are discussed. Results: Preoperative intraocular pressure (IOP) ranged from 36 mmHg to 62 mmHg (mean, 43.6 mmHg). Postoperative final IOP ranged from 3 mmHg to 27 mmHg (mean, 15.3 mmHg). This represents an absolute decrease of 28.3 mmHg (65%). Postoperatively, 9 eyes had an IOP of less than 21 mmHg, although 3 of these eyes required medication. One eye attained a final IOP of 27 mmHg. All eyes were treated once. Nine patients were treated with carbonic anhydrase inhibitors preoperatively, and six patients were able to discontinue this medication postoperatively. Phthisis was not observed, but hypotony evolved in two eyes with chronic retinal detachment. Follow-up ranged from 6 to 11 months (mean, 8.8 months). Conclusion: This new therapeutic modality, which combines endoscopic visualization of the ciliary processes with diode Laser photocoagulation, can be effective in the management of intractable neovascular glaucoma.
Nathaniel M Fried - One of the best experts on this subject based on the ideXlab platform.
-
characterization of novel microsphere chain fiber optic tips for potential use in Ophthalmic Laser surgery
Journal of Biomedical Optics, 2012Co-Authors: Thomas C Hutchens, Arash Darafsheh, Amir Fardad, Andrew N Antoszyk, Howard S Ying, Vasily N Astratov, Nathaniel M FriedAbstract:Ophthalmic surgery may benefit from use of more precise fiber delivery systems during Laser surgery. Some current Ophthalmic surgical techniques rely on tedious mechanical dissection of tissue layers. In this study, chains of sapphire microspheres integrated into a hollow waveguide distal tip are used for erbium:YAG Laser ablation studies in contact mode with Ophthalmic tissues, ex vivo. The Laser’s short optical penetration depth combined with the small spot diameters achieved with this fiber probe may provide more precise tissue removal. One-, three-, and five-microsphere chain structures were characterized, resulting in FWHM diameters of 67, 32, and 30 μm in air, respectively, with beam profiles comparable to simulations. Single Er:YAG pulses of 0.1 mJ and 75-μs duration produced ablation craters with average diameters of 44, 30, and 17 μm and depths of 26, 10, and 8 μm, for one-, three-, and five-sphere structures, respectively. Microsphere chains produced spatial filtering of the multimode Er:YAG Laser beam and fiber, providing spot diameters not otherwise available with conventional fiber systems. Because of the extremely shallow treatment depth, compact focused beam, and contact mode operation, this probe may have potential for use in dissecting epiretinal membranes and other Ophthalmic tissues without damaging adjacent retinal tissue.
-
novel microsphere chain fiber tips for use in mid infrared Ophthalmic Laser surgery
Proceedings of SPIE, 2012Co-Authors: Thomas C Hutchens, Arash Darafsheh, Amir Fardad, Andrew N Antoszyk, Howard S Ying, Vasily N Astratov, Nathaniel M FriedAbstract:Ophthalmic surgery may benefit from the use of more precise fiber delivery systems for Laser surgery. In this study, chains of sapphire microspheres integrated into the distal tip of a hollow waveguide are used for preliminary mid-infrared, Erbium:YAG Laser ablation studies in contact mode with Ophthalmic tissues, ex vivo. The combination of the Er:YAG Laser's short optical penetration depth and small spot diameters achieved with this novel fiber probe may provide more precise tissue removal. One, three, and five microsphere chain structures were assembled and compared, resulting in spot diameters of 67, 32, and 30 μm, respectively. Single Laser pulses of 0.1 mJ energy and 75 μs duration produced craters with average widths of 44, 30, and 17 μm and depths of 26, 10, and 8 μm, for one, three, and five sphere structures, respectively. Chains of microspheres produced spatial filtering of the multimode Er:YAG Laser beam and fiber, thus providing spot diameters not otherwise available for precise tissue ablation using conventional fiber delivery systems. With further probe development, this novel approach to mid-IR Laser ablation may provide an alternative to mechanical tools for ultra-precise surgical dissection and removal of Ophthalmic tissues.
Stanley J Berke - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a cyclodialysis cleft by means of Ophthalmic Laser microendoscope endophotocoagulation
American Journal of Ophthalmology, 1999Co-Authors: Ronald M Caronia, Richard T Sturm, Maury Marmor, Stanley J BerkeAbstract:PURPOSE: To report on the repair of a cyclodialysis cleft by means of endoLaser photocoagulation. METHOD: Case report. We describe treatment of a cyclodialysis cleft by means of endoLaser photocoagulation with a diode Laser. RESULTS: In a 8-year-old boy with pseudophakia and secondary glaucoma in the right eye, combined trabeculectomy/trabeculotomy was performed. Ten months later, the patient was seen with persistent hypotony with a flat filtration bleb. The hypotony was unresponsive to all forms of medical therapy. Reformation of the anterior chamber along with synechialysis revealed a 2.5 clock–hour cyclodialysis cleft by means of gonioscopy. A Laser microendoscope probe was used and Laser was applied to both the internal scleral and external ciliary body surfaces within the depths of the cleft. Within 3 weeks after treatment, intraocular pressure increased to 15 mm Hg and has remained at that level as of 9 months after the endoLaser photocoagulation procedure. CONCLUSION: EndoLaser photocoagulation with the Ophthalmic Laser microendoscope may be an appropriate procedure, after failure of medical therapy, for the diagnosis and repair of a cyclodialysis cleft, especially in the pediatric population.
Thomas C Hutchens - One of the best experts on this subject based on the ideXlab platform.
-
characterization of novel microsphere chain fiber optic tips for potential use in Ophthalmic Laser surgery
Journal of Biomedical Optics, 2012Co-Authors: Thomas C Hutchens, Arash Darafsheh, Amir Fardad, Andrew N Antoszyk, Howard S Ying, Vasily N Astratov, Nathaniel M FriedAbstract:Ophthalmic surgery may benefit from use of more precise fiber delivery systems during Laser surgery. Some current Ophthalmic surgical techniques rely on tedious mechanical dissection of tissue layers. In this study, chains of sapphire microspheres integrated into a hollow waveguide distal tip are used for erbium:YAG Laser ablation studies in contact mode with Ophthalmic tissues, ex vivo. The Laser’s short optical penetration depth combined with the small spot diameters achieved with this fiber probe may provide more precise tissue removal. One-, three-, and five-microsphere chain structures were characterized, resulting in FWHM diameters of 67, 32, and 30 μm in air, respectively, with beam profiles comparable to simulations. Single Er:YAG pulses of 0.1 mJ and 75-μs duration produced ablation craters with average diameters of 44, 30, and 17 μm and depths of 26, 10, and 8 μm, for one-, three-, and five-sphere structures, respectively. Microsphere chains produced spatial filtering of the multimode Er:YAG Laser beam and fiber, providing spot diameters not otherwise available with conventional fiber systems. Because of the extremely shallow treatment depth, compact focused beam, and contact mode operation, this probe may have potential for use in dissecting epiretinal membranes and other Ophthalmic tissues without damaging adjacent retinal tissue.
-
novel microsphere chain fiber tips for use in mid infrared Ophthalmic Laser surgery
Proceedings of SPIE, 2012Co-Authors: Thomas C Hutchens, Arash Darafsheh, Amir Fardad, Andrew N Antoszyk, Howard S Ying, Vasily N Astratov, Nathaniel M FriedAbstract:Ophthalmic surgery may benefit from the use of more precise fiber delivery systems for Laser surgery. In this study, chains of sapphire microspheres integrated into the distal tip of a hollow waveguide are used for preliminary mid-infrared, Erbium:YAG Laser ablation studies in contact mode with Ophthalmic tissues, ex vivo. The combination of the Er:YAG Laser's short optical penetration depth and small spot diameters achieved with this novel fiber probe may provide more precise tissue removal. One, three, and five microsphere chain structures were assembled and compared, resulting in spot diameters of 67, 32, and 30 μm, respectively. Single Laser pulses of 0.1 mJ energy and 75 μs duration produced craters with average widths of 44, 30, and 17 μm and depths of 26, 10, and 8 μm, for one, three, and five sphere structures, respectively. Chains of microspheres produced spatial filtering of the multimode Er:YAG Laser beam and fiber, thus providing spot diameters not otherwise available for precise tissue ablation using conventional fiber delivery systems. With further probe development, this novel approach to mid-IR Laser ablation may provide an alternative to mechanical tools for ultra-precise surgical dissection and removal of Ophthalmic tissues.
Ronald M Caronia - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a cyclodialysis cleft by means of Ophthalmic Laser microendoscope endophotocoagulation
American Journal of Ophthalmology, 1999Co-Authors: Ronald M Caronia, Richard T Sturm, Maury Marmor, Stanley J BerkeAbstract:PURPOSE: To report on the repair of a cyclodialysis cleft by means of endoLaser photocoagulation. METHOD: Case report. We describe treatment of a cyclodialysis cleft by means of endoLaser photocoagulation with a diode Laser. RESULTS: In a 8-year-old boy with pseudophakia and secondary glaucoma in the right eye, combined trabeculectomy/trabeculotomy was performed. Ten months later, the patient was seen with persistent hypotony with a flat filtration bleb. The hypotony was unresponsive to all forms of medical therapy. Reformation of the anterior chamber along with synechialysis revealed a 2.5 clock–hour cyclodialysis cleft by means of gonioscopy. A Laser microendoscope probe was used and Laser was applied to both the internal scleral and external ciliary body surfaces within the depths of the cleft. Within 3 weeks after treatment, intraocular pressure increased to 15 mm Hg and has remained at that level as of 9 months after the endoLaser photocoagulation procedure. CONCLUSION: EndoLaser photocoagulation with the Ophthalmic Laser microendoscope may be an appropriate procedure, after failure of medical therapy, for the diagnosis and repair of a cyclodialysis cleft, especially in the pediatric population.