1. Articles in category: Ophthalmology

    121-144 of 12164 « 1 2 ... 3 4 5 6 7 8 9 ... 505 506 507 »
    1. Foveal avascular zone and macular vessel density after correction for magnification error in unilateral amblyopia using optical coherence tomography angiography

      Foveal avascular zone and macular vessel density after correction for magnification error in unilateral amblyopia using optical coherence tomography angiography

      Background To investigate the area of foveal avascular zone (FAZ) and macular vessel density (VD) after correction for magnification error in unilateral amblyopia using optical coherence tomography angiography (OCTA). Methods Participants comprised 15 patients with unilateral amblyopia due to anisometropia with or without strabismus (mean age, 9.8 ± 3.4 years; range, 6–17 years). OCTA images were obtained by using spectral-domain OCT with angiography software. The OCTA scanning protocol used was 3 × 3-mm volume scan centered on the fovea. OCTA images were corrected for magnification errors using individual axial length (AL), and an adjusted 2.3 × 2.3-mm square ...

      Read Full Article
    2. Anterior vitreous detachment: risk factor for intraoperative complications during phacoemulsification

      Anterior vitreous detachment: risk factor for intraoperative complications during phacoemulsification

      Purpose To confirm the presence of incomplete vitreo-lenticular adhesion via microscope-integrated intraoperative optical coherence tomography (iOCT) during cataract surgery and via diagnostic spectral-domain OCT postoperatively. Setting S. Fyodorov Eye Microsurgery Complex State Institution, Moscow, Russia; Design Prospective, non-interventional, single-center study. Methods Clinical characteristics and surgical videos of 27 patients (28 eyes) who underwent cataract surgery were documented. Real-time iOCT integrated into the surgical microscope was directed to view the retro-lenticular anatomy at the end of the surgery. Postoperatively, spectral-domain OCT was also performed. Results Berger’s space could be identified in 21 cases (75%) intraoperatively via iOCT and in 23 ...

      Read Full Article
    3. Dr. Kester Nahen joins Notal Vision as Chief Commercial Officer

      Dr. Kester Nahen joins Notal Vision as Chief Commercial Officer

      Notal Vision, Inc., a company focused on advancing eye care with precision medicine by extending disease management from the clinic to the home, is pleased to announce the appointment of Kester Nahen, PhD to Chief Commercial Officer. Dr. Nahen is a medical device industry expert and brings more than 18 years of well-rounded international business experience in product management, medical science, clinical research, marketing, sales, professional education, and business development to the company. "I am delighted to welcome Kester to the Notal Vision executive team,” stated Dr. Susan Orr, Chief Executive Officer of Notal Vision. “I am confident that his ...

      Read Full Article
    4. Development of optical coherence tomography methods for imaging and analysis of the structure and function of the choroid in the human eye.

      Development of optical coherence tomography methods for imaging and analysis of the structure and function of the choroid in the human eye.

      POSITION 1 Post-doctoral fellow position PROJECT Development of optical coherence tomography methods for imaging and analysis of the structure and function of the choroid in the human eye. Brief description of the project: http://lab.fizyka.umk.pl/670-2/ FUNDING ORGANIZATION, PROGRAMME AND PROJECT NUMBER National Science Center of Poland, OPUS 16, 2018/31/B/ST7/03138; FELLOWSHIP DURATION Maximum: 33 months (October 1st, 2019 – June 12th, 2022) Minimum: 12 months (October 1st, 2019 – December 31st, 2020) APPLICATION DEADLINE September 6th 2019, 11:59 PM (CEST) INQUIRIES AND APPLICATION CONTACT iwona.gorczynska@fizyka.umk.pl DOWNLOADS General information Application form ...

      Read Full Article
    5. Doheny Eye Institute Receives NIH Grant for Discovery and Validation of AMD Biomarkers for Progression Using Deep Learning

      Doheny Eye Institute Receives NIH Grant for Discovery and Validation of AMD Biomarkers for Progression Using Deep Learning

      Doheny Eye Institute Receives a 2019 NIH Grant for $235,500 for Discovery and Validation of AMD Biomarkers for Progression Using Deep Learning. The principal investigator is Zhihong Hu. Below is a summary of the proposed work. Age-related macular degeneration (AMD) is the leading cause of blindness among elderly individuals. Currently there are no proven effective therapies for treatment of advanced non-neovascular AMD, termed geographic atrophy (GA). Earlier intervention may be preferable, but this would require identification of those individuals with the highest risk for progression to atrophy. Over the last two decades, various studies including ours have identified several ...

      Read Full Article
      Mentions: UCSF Zhihong Hu
    6. Correlation between pigmented arc and epithelial thickness (COPE) study in orthokeratology-treated patients using OCT measurements

      Correlation between pigmented arc and epithelial thickness (COPE) study in orthokeratology-treated patients using OCT measurements

      Purpose To determine the intensity of corneal pigmented arc in orthokeratology (ortho-k)-treated children, and its correlation with key epithelial thickness measurements obtained by anterior segment optical coherence tomography (AS-OCT). Methods This study is a retrospective case series. Medical records of children who received ortho-k treatment for myopia control in our hospital were reviewed. Intensity of ortho-k-associated pigmented arc and its correlation with key epithelial thickness parameters in the central 7-mm-diameter zone obtained by AS-OCT was examined. The subjects were further divided into apparent and unapparent pigmented arc groups for severity comparison. Results The mean age of children was 11 ...

      Read Full Article
    7. Chronic chiasmal compression and persistent visual field defect without detectable changes in optical coherence tomography of the macular ganglion cell complex

      Chronic chiasmal compression and persistent visual field defect without detectable changes in optical coherence tomography of the macular ganglion cell complex

      Purpose Optical coherence tomography (OCT) of the retinal nerve fiber layer (RNFL) and macular ganglion cell complex (GCC) are important in the ophthalmological evaluation of patients with sellar masses. Changes in OCT of the RNFL and macular GCC often precede visual field changes in patients with chronic chiasmal compression. OCT of the macular GCC has been shown to have better correlation with visual function and allow for even earlier detection of compression of the anterior visual pathways. We present a case of a chronic visual field defect from a pituitary adenoma with largely normal OCT parameters and only subtle changes ...

      Read Full Article
    8. Interspecies Variation of Outer Retina and Choriocapillaris Imaged With Optical Coherence Tomography

      Interspecies Variation of Outer Retina and Choriocapillaris Imaged With Optical Coherence Tomography

      Purpose : The purpose of this study is to assess with spectral-domain optical coherence tomography (OCT) the interspecies variation of outer retinal morphology and identification of choriocapillaris in four research animal species. Methods : Spectralis HRA+OCT images acquired from locations dorsal, central, and ventral to the optic disc in healthy, anesthetized animals were evaluated by two independent readers. First, the number of OCT B-scans on which a choriocapillaris layer could clearly be identified was determined and quantified, and B-scans were correlated with histology. Second, B-scans demonstrating the highest number of discernable individual outer retinal bands (ORBs) were defined as ideal presentation ...

      Read Full Article
    9. Volumetric Analysis of Vascularized Serous Pigment Epithelial Detachment Progression in Neovascular Age-Related Macular Degeneration Using Optical Coherence Tomography Angiography

      Volumetric Analysis of Vascularized Serous Pigment Epithelial Detachment Progression in Neovascular Age-Related Macular Degeneration Using Optical Coherence Tomography Angiography

      Purpose : To analyze the evolution of type 1 neovascularization associated with vascularized serous pigment epithelial detachment (vsPED) using three-dimensional, volumetric, en face optical coherence tomography angiography (OCTA). Methods : This was a retrospective case series from four tertiary medical centers. OCTA images were analyzed at baseline and at the 3-, 6-, 12-, 18-, and 24-month follow-up visit when available. Visual acuity, number of injections, PED maximal height and PED area and volume, and choroidal neovascularization (CNV) flow area and progression were determined at each visit. Qualitative and quantitative analysis of CNV progression (including CNV/PED flow area) and final PED morphology ...

      Read Full Article
    10. Prognostic role of optical coherence tomography after switch to dexamethasone in diabetic macular edema

      Prognostic role of optical coherence tomography after switch to dexamethasone in diabetic macular edema

      Aims To analyze the visual outcome after early switch to dexamethasone (DEX) in eyes with diabetic macular edema previously treated with ranibizumab (RNB), based on structural spectral-domain optical coherence tomography (SD-OCT) features. Methods Retrospective study of data from 28 eyes which underwent a loading dose of three monthly RNB injections and were then shifted to DEX implant injection. SD-OCT analysis was performed before switch to DEX (week 12, 12W) according to the presence of integrity of ellipsoid zone (EZ) and external limiting membrane (ELM), disorganization of retinal inner layers (DRIL), and quantity of hyper-reflective spots (HRS). Best-corrected visual acuity (BCVA ...

      Read Full Article
    11. Evaluation of Retinal Pigment Epithelium Layer Change in Vogt-Koyanagi-Harada Disease With Multicontrast Optical Coherence Tomography

      Evaluation of Retinal Pigment Epithelium Layer Change in Vogt-Koyanagi-Harada Disease With Multicontrast Optical Coherence Tomography

      Purpose : Clinical evaluation of retinal pigment epithelium (RPE) change is important for the therapeutic management of chronic Vogt-Koyanagi-Harada (VKH) disease. We evaluated long-term change in the RPE layer in VKH disease, using near-infrared (NIR; 817 nm) images and autofluorescence images at 488 nm (short-wavelength [SW]-AF) and 785 nm (NIR-AF), and compared those images with images from multicontrast optical coherence tomography (MC-OCT). MC-OCT is capable of simultaneous measurement of OCT angiography, polarization-sensitive OCT, and standard OCT. Methods : We evaluated 24 eyes of 12 patients with chronic VKH disease. RPE changes were assessed using NIR, NIR-AF, SW-AF, and MC-OCT imaging performed ...

      Read Full Article
    12. Measurement of Oral Epithelial Thickness by Optical Coherence Tomography

      Measurement of Oral Epithelial Thickness by Optical Coherence Tomography

      Optical coherence tomography (OCT) is a real-time, in-situ, non-invasive imaging device that is able to perform a cross-sectional evaluation of tissue microstructure based on the specific intensity of back-scattered and reflected light. The aim of the present study was to define normal values of epithelial thickness within the oral cavity. OCT measurements of epithelial thickness were performed in 28 healthy patients at six different locations within the oral cavity. Image analysis was performed using Image J 1.52 software. The healthy epithelium has a mean thickness of 335.59 ± 150.73 µm. According to its location within the oral cavity ...

      Read Full Article
    13. OCT motion contrast data analysis apparatus and OCT motion contrast data analysis method

      OCT motion contrast data analysis apparatus and OCT motion contrast data analysis method

      An OCT motion contrast data analysis apparatus includes: a processor; and memory storing computer readable instructions, when executed by the processor, causing the OCT motion contrast data analysis apparatus to execute: acquiring OCT motion contrast data of a subject by an optical coherence tomography; and performing an analysis process with respect to the OCT motion contrast data based on an analysis chart set on image data different from the OCT motion contrast data.

      Read Full Article
      Mentions: Nidek
    14. Methods and systems for combined morphological and angiographic analyses of retinal features

      Methods and systems for combined morphological and angiographic analyses of retinal features

      Methods and systems in ophthalmic imaging are presented that increase the sensitivity of automated diagnoses by the use of a combination of both functional and structural information derived from a variety of ophthalmic imaging modalities. An example method to analyze image data of an eye of a patient includes processing a first image dataset to obtain one or more functional metrics; processing a second image dataset to obtain one or more structural metrics; comparing the one or more structural metrics to the one or more functional metrics; and processing the results of said comparison to derive the probability of a ...

      Read Full Article
    15. Computational Methods to Quantify Human Lens Shape and Optical Properties Using Laser Ray Tracing and Optical Coherence Tomography (Thesis)

      Computational Methods to Quantify Human Lens Shape and Optical Properties Using Laser Ray Tracing and Optical Coherence Tomography (Thesis)

      Vision is worsening on a global scale. Myopia, a visual condition where distant objects appear blurry, is increasing in prevalence at an alarming rate. This condition typically starts during childhood and progressively worsens, potentially leading to more severe visual conditions if left unchecked. Currently, the best treatment method to slow myopic progression is heavily debated as the etiology of myopia is not fully understood. The development of effective long-term solutions require a better understanding of how vision changes with age. The cornea and lens, the length of the human eye, and the surrounding ocular media dictate visual quality. Extensive studies ...

      Read Full Article
    16. Unifying Structure Analysis and Surrogate-driven Function Regression for Glaucoma OCT Image Screening

      Unifying Structure Analysis and Surrogate-driven Function Regression for Glaucoma OCT Image Screening

      Optical Coherence Tomography (OCT) imaging plays an important role in glaucoma diagnosis in clinical practice. Early detection and timely treatment can prevent glaucoma patients from permanent vision loss. However, only a dearth of automated methods has been developed based on OCT images for glaucoma study. In this paper, we present a novel framework to effectively classify glaucoma OCT images from normal ones. A semi-supervised learning strategy with smoothness assumption is applied for surrogate assignment of missing function regression labels. Besides, the proposed multi-task learning network is capable of exploring the structure and function relationship from the OCT image and visual ...

      Read Full Article
    17. Optical coherence tomography and cognitive dysfunction in Parkinson disease

      Optical coherence tomography and cognitive dysfunction in Parkinson disease

      Background Parkinson’s disease (PD) is a progressive neurodegenerative disease of aging. Optical coherence tomography (OCT) is a simple noninvasive imaging technique to estimate the retinal nerve fiber layer (RNFL) thickness. The aim of this study is to measure the changes of the RNFL thickness in patients with Parkinson disease in comparison with the control group and to detect the relationship between these changes in RNFL with cognitive functions and physical disability in Parkinson patients. Methods 20 PD patients (40 eyes) and 20 healthy persons (40 eyes) were enrolled according to the defined criteria. The diagnosis of the patient's ...

      Read Full Article
    18. A Novel Use of Optical Coherence Tomography for the Assessment of Ocular Torsion (Thesis)

      A Novel Use of Optical Coherence Tomography for the Assessment of Ocular Torsion (Thesis)

      Abnormal ocular torsion is most frequently the result paresis of the fourth cranial nerve. The presence of torsion can be a barrier to fusion, in which case, surgical intervention is required for a patient to have single vision. Clinically, ocular torsion can be measured either subjectively or objectively, the latter traditionally using the relationship between the fovea and the optic disc. However, previous literature has shown inconsistencies between torsion a patient’s perceived subjective torsion, and the amount of anatomical fundus torsion. Therefore, the aim of the current study was to investigate the relationship of subjective and objective ocular torsion ...

      Read Full Article
    19. Diagnostic Ability of Macular Vessel Density in the Ganglion Cell–Inner Plexiform Layer on Optical Coherence Tomographic Angiography for Glaucoma

      Diagnostic Ability of Macular Vessel Density in the Ganglion Cell–Inner Plexiform Layer on Optical Coherence Tomographic Angiography for Glaucoma

      Purpose : The purpose of this study was to analyze the macular vessel density layer-by-layer and compare the diagnostic value of each in diagnosing glaucoma. Methods : This was a prospective comparative cross-sectional study, and the setting was glaucoma referral practice. The study participants were patients with primary open-angle glaucoma undergoing treatment with drugs, and age-matched normal controls who visited our clinic for regular eye examinations for refractive errors. All participants were investigated using macular optical coherence tomographic angiography, fundus photography, and 24-2 visual field (VF) testing. Average vessel densities in the retinal nerve fiber–ganglion cell–inner plexiform layer (IPL), retinal ...

      Read Full Article
    20. Deep Learning Based Fluid Segmentation in Retinal Optical Coherence Tomography Images

      Deep Learning Based Fluid Segmentation in Retinal Optical Coherence Tomography Images

      Macular Edema (ME) is the accumulation of fluid in the macular region of the eye, and it may lead to the distortion of center vision. It often occurs in diabetic retinopathy. It is important to measure fluid accumulation in ME patients for disease monitor. Segmentation of the fluid region in the retinal layer is an essential step for quantitatively analysis. However, manual segmentation is time consuming and also subjective. In this paper, a new deep learning based segmentation method is proposed. The attention mechanism is introduced to automatically locate the fluid region, which can reduce the number of parameters compared ...

      Read Full Article
    21. Relationship of Posterior Capsular Opacification and Capsular Bend Type Investigation Based on Swept-source Optical Coherence Tomography

      Relationship of Posterior Capsular Opacification and Capsular Bend Type Investigation Based on Swept-source Optical Coherence Tomography

      Purpose : To investigate the relationship between capsular bend type and posterior capsule opacification (PCO) at a three-dimensional (3D) level using high-speed swept-source optical coherence tomography (SS-OCT). Methods : This was a retrospective study. A total of 99 eyes that underwent standard cataract surgery with phacoemulsification 2 years ago were analyzed. Standard SS-OCT radial scanning was performed in all eyes and the obtained photos were used for morphological observations of the capsular bend-IOL complex, the adhesion of posterior capsule to the IOL optic, and the position of the anterior capsulorhexis. Digital retroillumination photographs were taken of the posterior capsule of each eye ...

      Read Full Article
    22. RETOUCH: The Retinal OCT Fluid Detection and Segmentation Benchmark and Challenge

      RETOUCH: The Retinal OCT Fluid Detection and Segmentation Benchmark and Challenge

      Retinal swelling due to the accumulation of fluid is associated with the most vision-threatening retinal diseases. Optical coherence tomography (OCT) is the current standard of care in assessing the presence and quantity of retinal fluid and image-guided treatment management. Deep learning methods have made their impact across medical imaging, and many retinal OCT analysis methods have been proposed. However, it is currently not clear how successful they are in interpreting the retinal fluid on OCT, which is due to the lack of standardized benchmarks. To address this, we organized a challenge RETOUCH in conjunction with MICCAI 2017, with eight teams ...

      Read Full Article
    23. OCT Feasibility Older Hip Fracture

      OCT Feasibility Older Hip Fracture

      Optical coherent tomography (OCT) is a device used to achieve cross-sectional imaging of tissues. It is often used in ophthalmology and also has application in dermatology, cardiology and other specialities. Usually, in adults, a table-top device is used necessitating the transfer of patients to the location of the device. In children a hand held device is used meaning the device can be taken to the patients' location. To facilitate/ help design a future study, this study's aim is to assess the feasibility of achieving retinal imaging in older people who are recovering from hip fracture surgery using a hand ...

      Read Full Article
    24. Average Lens Density Quantification With Swept Source OCT Integrated Into the Iolmaster 700: An Optimized and Automatized Version of the Technique for Cataract Grading

      Average Lens Density Quantification With Swept Source OCT Integrated Into the Iolmaster 700: An Optimized and Automatized Version of the Technique for Cataract Grading

      Purpose To assess an upgraded version of our objective cataract grading method based on lens densitometry on Swept-Source Optical Coherence Tomography (SS-OCT) scans provided by the IOLMaster 700. Settings Single centre study at the Rothschild Foundation, Paris, France. Design Prospective cross-sectional study Methods All patients consulting for cataract evaluation and consenting to study participation were included. History of previous ocular surgery, cornea or retina disorders, and ocular dryness were exclusion criteria. The average lens densitometry (ALD) was measured on SS-OCT scans provided by the IOLMaster 700 using our algorithm developed on MATLAB® software. The ocular scatter index (OSI) was measured ...

      Read Full Article
    121-144 of 12164 « 1 2 ... 3 4 5 6 7 8 9 ... 505 506 507 »
  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) Università Vita-Salute San Raffaele
    2. (3 articles) Singapore Eye Research Institute
    3. (2 articles) University of Miami
    4. (2 articles) Johns Hopkins University
    5. (2 articles) UC Davis
    6. (2 articles) Duke University
    7. (2 articles) Medical University of Vienna
    8. (2 articles) University of Southern California
    9. (2 articles) Northwestern University
    10. (2 articles) University College London
    11. (2 articles) Cleveland Clinic
    12. (1 articles) Seoul National University
  4. People in the News

    1. (3 articles) Robert J. Zawadzki
    2. (2 articles) Tin Aung
    3. (2 articles) Mehdi Azimipour
    4. (2 articles) Giuseppe Querques
    5. (2 articles) Ravi S. Jonnal
    6. (2 articles) John S. Werner
    7. (2 articles) Francesco Bandello
    8. (2 articles) Pearse A. Keane
    9. (1 articles) Srinivas R. Sadda
    10. (1 articles) Roman V. Kuranov
    11. (1 articles) Giacomo Savini
    12. (1 articles) Christina J. Flaxel
  5. OCT Companies in the News

    1. (4 articles) Topcon Medical Systems
    2. (4 articles) Carl Zeiss Meditec
    3. (2 articles) Specsavers
    4. (2 articles) Optovue
    5. (1 articles) Bioptigen
    6. (1 articles) Opticent Health
    7. (1 articles) Tomey Corporation