1. Articles in category: Ophthalmology

    12121-12144 of 13185 « 1 2 ... 503 504 505 506 507 508 509 ... 548 549 550 »
    1. Transplantation of a tissue-engineered corneal endothelium reconstructed on a devitalized carrier in the feline model

      Purpose. To evaluate the functional outcome of a tissue-engineered corneal endothelium reconstructed on a devitalized carrier and transplanted in the living feline model. Methods. Eighteen healthy adult cats underwent full thickness corneal transplantation. In 11 animals, the donor cornea was reconstructed from cultured allogeneic feline corneal endothelial cells seeded on the denuded Descemet’s membrane of a devitalized human cornea. The reconstructed corneal endothelium was cultured for two weeks before transplantation. Five control animals received either an autologous (n=1), an allogeneic (n=3) or a human xenogeneic (n=1) native cornea. Two other control animals were grafted with the ...
      Read Full Article
    2. Eye Scans Could Reveal Brain Health Status: An optical version of Ultrasound

      Eye Scans Could Reveal Brain Health Status: An optical version of Ultrasound
      Over the past few years, advancements in the field of opthalmology have allowed physicians to take better care of patients suffering from widespread diseases such as glaucoma and diabetic retinopathy. A new device that can scan the retina in a non-invasive manner has been devised recently, according to researchers at Danesh-Meyer. The new system, known as optical coherence tomography (OCT), allows for light beams to penetrate the deep layers of the retina – as much as a few millimeters deep – and to analyze any type of inconsistencies that may have occurred in the area, which could be indicators of severe brain ...
      Read Full Article
    3. Multidimensional eye tracking and position measurement system for diagnosis and treatment of the eye

      The present invention relates to improved ophthalmic diagnostic measurement or treatment methods or devices, that make use of a combination of a high speed eye tracking device, measuring fast translation or saccadic motion of the eye, and an eye position measurement device, determining multiple dimensions of eye position or other components of eye, relative to an ophthalmic diagnostic or treatment instrument.
      Read Full Article
    4. Topcon granted FDA clearance for OCT measurement software

      Paramus, NJ—Topcon Medical Systems has received FDA clearance for its enhanced 3D optical coherence tomography (OCT) measurement software (OCT-1000 TrueMap) as an addition to its previously cleared OCT system (3D OCT-1000), according to a prepared statement. The software, according to the company, is designed to allow physicians to visualize four layers of the retina: the inner limiting membrane, the IS/OS junction, the retinal pigment epithelium, and Bruch’s membrane. The software also can import and read data from a time-domain OCT device (Stratus, Carl Zeiss Meditec).
      Read Full Article
    5. Enhanced Depth Imaging Optical Coherence Tomography of Retinal Pigment Epithelial Detachment in Age-related Macular Degeneration

      Purpose: To describe the internal structure of pigment epithelial detachments (PEDs) seen in eyes with age-related macular degeneration (AMD) as imaged with enhanced depth imaging (EDI) spectral-domain optical coherence tomography (OCT).Design: Retrospective observational case series.Methods: The images were obtained by positioning a spectral-domain OCT device close enough to the eye to obtain an inverted image and 7 sections, each comprised of 100 averaged scans, were obtained within a 5 degrees × 15 degrees or larger rectangle to encompass the PED and accompanying neovascularization if present. The resultant images were reinverted and compared with fluorescein and indocyanine green angiographic findings ...
      Read Full Article
    6. OCT will be a draw at show

      Zeiss, Grafton, Haag Streit and Topcon will exhibit their latest scanners, which enable practices to provide in-depth pre-screening and clinical care for charges of between £25 and £150 for a four-minute procedure. Andy Yorke, managing director of Topcon said: 'The ability to look beyond the retinal surface into the sub-retinal layers presents us with diagnostic opportunities not seen before and provides the clinician with the ability to detect eye diseases much earlier.'
      Read Full Article
    7. Foveal Microstructure and Visual Acuity after Retinal Detachment Repair: Imaging Analysis by Fourier-Domain Optical Coherence Tomography

      Purpose To evaluate foveal microstructural changes in eyes with anatomically successful repair of rhegmatogenous retinal detachments (RRDs). Design Retrospective, consecutive, observational case series. Participants Fifty-three eyes of 51 consecutive patients with macula-on RRDs (15 eyes) or macula-off RRDs (38 eyes) after anatomically successful surgical repair. Methods A microscopic fundus examination was conducted followed by Fourier-domain optical coherence tomography (FD-OCT) to assess the postoperative foveal microstructure. The correlation between the postoperative best-corrected visual acuity (BCVA) and microstructural findings at the fovea was evaluated. Main Outcome Measures Images of the foveal microstructure obtained by FD-OCT and the BCVA measured on the same ...
      Read Full Article
      Mentions: Osaka University
    8. Foveal thickness after cataract surgery – Measurement by optical coherence tomography

      Summary  BACKGROUND: To examine macular thickness changes after uncomplicated cataract surgery in healthy patients and patients with diabetes mellitus and/or arterial hypertension without ocular manifestation. SETTING: Department of Ophthalmology, Rudolf Foundation Clinic, Ludwig Boltzmann Institute of Retinology and Biomicroscopic Lasersurgery, Vienna, Austria. METHODS: Prospective study with uneventful cataract surgery. Patients were subdevided into two groups. In group one, we included 10 patients without any general internal disease, in group two 15 patients with diabetes and/or arterial hypertension without ocular pathologies. Patients were examined preoperatively, one day, 1, 4 and 12 weeks postoperatively. At each visit a complete ophthalmic ...
      Read Full Article
    9. Scan Tracking Coordinates for Improved Centering of Stratus OCT Scan Pattern.

      Objective: To describe and evaluate a technique to optimize scan centering during the Stratus optical coherence tomography (OCT) image acquisition process using currently available scan tracking coordinates. Design: Observational clinical study. Participants: Twelve eyes of six normal subjects were examined using the Fast retinal nerve fiber layer (RNFL) thickness and the Fast Optic Disc acquisition protocols. Methods: At visit 1, 3 consecutive measurements (trials) were taken by 2 different operators with the scan subjectively centered on the optic disc for the Fast RNFL thickness protocol and Fast Optic Disc protocol. At visit 2, 3 consecutive measurements were taken by positioning ...
      Read Full Article
    10. The Correlation Between Visual Field Defects and Focal Nerve Fiber Layer Thickness Measured With Optical Coherence Tomography in the Evaluation of Glaucoma.

      Purpose: To study the correlation between known visual field defects and retinal nerve fiber layer (RNFL) thickness detected by optical coherence tomography (OCT) in glaucomatous eyes. Materials and Methods: Visual field parameters and OCT RNFL measurements of 28 eyes of 28 glaucoma patients with various stages of glaucoma were compared with 38 eyes of 38 normal age-matched controls. A perimetric nerve fiber bundle map was built by dividing the visual field area into 21 zones. Mean deviation and pattern standard deviation values within these 21 zones were compared with OCT RNFL thickness measurements in 12 sectors and the results were ...
      Read Full Article
    11. Single-camera sequential-scan-based polarization-sensitive SDOCT for retinal imaging

      Single-camera sequential-scan-based polarization-sensitive SDOCT for retinal imaging
      A single-camera, high-speed, polarization-sensitive, spectral-domain optical-coherence-tomography system was developed to measure the polarization properties of the in vivo human retina. A novel phase-unwrapping method in birefringent media is described to extract the total reflectivity, accumulative retardance, and fast-axis orientation from a specially designed sequence of polarization states incident on the sample. A quarter-wave plate was employed to test the performance of the system. The average error and standard deviation of retardation measurements were 3.2° and 2.3°, respectively, and of the fast-axis orientation 1.2° and 0.7° over the range of 0°-180°. The depolarization properties of the ...
      Read Full Article
    12. Evaluation of ranibizumab-induced changes of high-resolution optical coherence tomographic retinal morphology and their impact on visual function

      Purpose: To evaluate the effects of intravitreal ranibizumab on retinal function and morphology and to identify a correlation between anatomy and function by using spectral domain optical coherence tomography (SDOCT). Methods: Twenty three patients affected by neovascular AMD received three monthly injections of ranibizumab and were monitored by assessing best-corrected visual acuity (BCVA), central retinal sensitivity (CRS) and morphologic changes at the level of the retina and the retinal pigment epithelium (RPE) using SDOCT segmentation. These were mean retinal thickness (MRT), central retinal thickness (CRT), area of the RPE pathology (lesion area). Results: BCVA increased from a mean 60.1 ...
      Read Full Article
    13. Correlation between Retina Blood Flow Velocity Assessed by Retinal Function Imager and Retina Thickness Estimated by Scanning Laser Ophthalmoscopy/Optical Coherence Tomography

      Purpose: The purpose of this study was to evaluate the correlation between the retinal blood flow (RBF) assessed by the retinal functional imager (RFI) and central macular thickness/volume assessed by a spectral scanning laser ophthalmoscopy/optical coherence tomography (SLO-OCT) system. Methods: Seventeen eyes of 14 consecutive patients with various ocular diseases were examined. Retinal blood circulation characteristics were measured using the RFI. Retinal thickness/volume parameters were obtained by SLO-OCT. Analysis of correlation between RBF velocity and SLO-OCT findings was performed. Results: The analysis of the correlation between RBF and central retinal thickness/volume (5 × 5 mm grid pattern ...
      Read Full Article
    14. Eye docs eye imaging, laser systems

      Eye docs eye imaging, laser systems
      Between laser surgery techniques and imaging methods, such as optical coherence tomography (OCT), optics and photonics made up a sizable portion of the conference content and exhibit hall at the American Academy of Ophthalmology (AAO) annual meeting 2008. The event drew approximately 22,000 attendees to Atlanta, GA, Nov. 7–11. OCT was discussed both in conference sessions dedicated to the topic and in others with a more general focus. A dedicated session drew an audience of more than 200. When t
      Read Full Article
    15. Abnormal Foveal Morphology in Ocular Albinism Imaged With Spectral-Domain Optical Coherence Tomography

      Objectives  To evaluate the spectrum of foveal architecture in pediatric albinism and to assess the utility of spectral-domain optical coherence tomography (OCT) in ocular imaging of children with nystagmus. Methods  Spectral-domain OCT imaging was performed on study subjects in 3 groups: subjects with ocular albinism (OA) or suspected OA with foveal hypoplasia, with nystagmus, and with or without iris transillumination; a subject with oculocutaneous albinism and Hermansky-Pudlak syndrome; and control subjects. Dense volumetric scans of each fovea were captured using standard and handheld spectral-domain OCT devices. Images were postprocessed and scored for the presence and configuration of each retinal layer ...
      Read Full Article
    16. Differentiating Optic Disc Edema From Optic Nerve Head Drusen on Optical Coherence Tomography

      Objective  To assess optical coherence tomography in differentiating optic disc edema (ODE) due to papilledema and other optic neuropathies from optic nerve head drusen (ONHD). Methods  Optical coherence tomographic images from 60 subjects (20 with ODE, 20 with ONHD, and 20 control subjects) were assessed qualitatively and quantitatively. Qualitative criteria for ODE included an elevated optic nerve head with smooth internal contour and subretinal hyporeflective space (SHYPS) with recumbent "lazy V" pattern. Optic nerve head drusen displayed a "lumpy-bumpy" internal optic nerve contour and a rapid decline in SHYPS thickness. Quantitative comparisons included retinal nerve fiber layer and SHYPS thickness ...
      Read Full Article
    17. Optical Coherence Tomography in the Eyes of Normal Children

      Objective To collect a normative database of macular thickness, retinal nerve fiber layer (RNFL) thicknesses, and optic nerve topography in the healthy eyes of children aged 3 to 17 years using optical coherence tomography (OCT) measurements. Methods Scans were obtained for 286 healthy children (black, 114; white, 154; other, 18). Each child had a dilated eye examination, an axial length measurement using the IOL Master (Carl Zeiss Meditec, Dublin, California), and OCT measurements using the fast macular map, fast RNFL thickness, and fast optic disc protocols of the Stratus OCT (OCT-3; Carl Zeiss Meditec). Results Black children had smaller macular ...
      Read Full Article
    18. Serous Macular Detachment Due to Diabetic Papillopathy Detected Using Optical Coherence Tomography

      Diabetic papillopathy (DP) is a syndrome characterized by self-limited unilateral or bilateral optic disc swelling associated with minimal or no permanent loss of visual function.1-3 Diabetic papillopathy may occur in patients with type 1 diabetes mellitus (DM)1 and type 2 DM,2-3 with approximately a 0.5% incidence1 irrespective of metabolic control and severity of diabetic retinopathy. Reportedly, DP often (in approximately 70% of cases) accompanies macular edema, which is a major cause of vision loss in patients with DP even without retinal capillary leakage and is presumed to be an extension of disc edema in some cases ...
      Read Full Article
    19. Anterior Segment Optical Coherence Tomography as a Diagnostic Tool for Cyclodialysis Clefts

      Anterior segment optical coherence tomography (OCT) is a noninvasive, painless, noncontact technique that provides accurate and reproducible images. This technique correlates well with ultrasound biomicroscopy, allows observation of iridocorneal angle abnormalities in the presence of opaque media, and is easier to perform than ultrasound biomicroscopy. A cyclodialysis cleft results from separation of the longitudinal ciliary muscle fibers from the scleral spur and establishes a new drainage pathway for aqueous humor between the anterior chamber and the suprachoroidal space. This new drainage channel increases uveoscleral outflow and may result in chronic ocular hypotonia; it is sometimes complicated by decreased visual acuity ...
      Read Full Article
    20. Anti-VEGF therapy requires more customized, flexible approach

      The PrONTO (Prospective optical coherence tomography imaging of patients with neovascular age-related macular degeneration treated with intraocular Lucentis) study suggested a different, flexible regimen. In the 2 years of the trial, patients were enrolled to receive three consecutive monthly intravitreal injections of ranibizumab. Thereafter, re-treatment was performed only if one of the following changes was observed in between visits: a loss of five letters in conjunction with fluid in the macula as detected by OCT; an increase in OCT central retinal thickness of at least 100 µm; new onset classic CNV; and new macular hemorrhage or persistent macular fluid detected ...
      Read Full Article
    21. Microcystoid Maculopathy Associated With Tamoxifen Use Diagnosed By High-Resolution Fourier-Domain Optical Coherence Tomography.

      Purpose: To describe a case of microcystoid maculopathy diagnosed by high-resolution Fourier-domain optical coherence tomography (Fd-OCT) in a patient treated with tamoxifen who had previously unexplained vision loss. Methods: Report of a case of a 66-year-old woman treated with tamoxifen for 4 years who had progressive unexplained vision loss in the left eye for 2 years. Results: Visual acuity was 20/25 in the right eye and 20/70 in the left eye. Findings of funduscopy and fluorescein angiography were unremarkable except for minimal pigment alteration in the macula in the left eye. Stratus OCT showed possible microcystoid changes in ...
      Read Full Article
    22. Optical Coherence Tomography Of West African Crystalline Maculopathy.

      A 47-year-old West African woman presented with bilateral refractile crystals in the fovea. She had proliferative diabetic retinopathy and a history of chewing kola nuts. She was diagnosed with West African crystalline maculopathy. Optical coherence tomography revealed that the foveal crystals were located in the innermost layers of the retina.Page: 31DOI: 10.1097/ICB.0b013e3181613477Authors: Baker, Paul S. MD *; Ho, Allen C. MD +; Spirn, Marc J. MD +
      Read Full Article
    12121-12144 of 13185 « 1 2 ... 503 504 505 506 507 508 509 ... 548 549 550 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Popular Articles

  3. Organizations in the News

    1. (4 articles) National Institutes of Health
    2. (4 articles) Duke University
    3. (4 articles) University College London
    4. (3 articles) Fudan University
    5. (3 articles) Medical University of Vienna
    6. (3 articles) University of Milan
    7. (3 articles) UCLA
    8. (2 articles) University of Houston
    9. (2 articles) Stanford University
    10. (2 articles) University of Southern California
    11. (2 articles) Seoul National University
    12. (2 articles) Singapore Eye Research Institute
  4. People in the News

    1. (2 articles) Srinivas R. Sadda
    2. (2 articles) Giovanni Gregori
    3. (2 articles) Philip J. Rosenfeld
    4. (2 articles) Jay S. Duker
    5. (2 articles) Pearse A. Keane
    6. (2 articles) Andre J. Witkin
    7. (2 articles) Joseph A. Izatt
    8. (2 articles) Kirill V. Larin
    9. (2 articles) Nadia K. Waheed
    10. (1 articles) Eric H. Souied
    11. (1 articles) Boris Považay
    12. (1 articles) Rainer A. Leitgeb
  5. OCT Companies in the News

    1. (8 articles) Carl Zeiss Meditec
    2. (4 articles) Topcon Medical Systems
    3. (4 articles) Optovue
    4. (3 articles) Heidelberg Engineering
    5. (2 articles) Tomey Corporation
    6. (2 articles) Alcon
    7. (1 articles) Lumedica
    8. (1 articles) LighTopTech
    9. (1 articles) Imagine Eyes
    10. (1 articles) Haag-Streit
    11. (1 articles) Notal Vision