1. Articles in category: Ophthalmology

    49-72 of 15537 « 1 2 3 4 5 6 ... 646 647 648 »
    1. In Vivo Subretinal ARPE-19 Cell Tracking Using Indocyanine Green Contrast-Enhanced Multimodality Photoacoustic Microscopy, Optical Coherence Tomography, and Fluorescence Imaging for Regenerative Medicine

      In Vivo Subretinal ARPE-19 Cell Tracking Using Indocyanine Green Contrast-Enhanced Multimodality Photoacoustic Microscopy, Optical Coherence Tomography, and Fluorescence Imaging for Regenerative Medicine

      Purpose: Cell-based regenerative therapies are being investigated as a novel treatment method to treat currently incurable eye diseases, such as geographic atrophy in macular degeneration. Photoacoustic imaging is a promising technology which can visualize transplanted stem cells in vivo longitudinally over time in the retina. In this study, a US Food and Drug Administration (FDA)-approved indocyanine green (ICG) contrast agent is used for labeling and tracking cell distribution and viability using multimodal photoacoustic microscopy (PAM), optical coherence tomography (OCT), and fluorescence imaging. Methods: Twelve rabbits (2.4-3.4 kg weight, 2-4 months old) were used in the study. Human ...

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    2. Evaluation of the effect of high-intensity interval training on macular microcirculation via swept-source optical coherence tomography angiography in young football players

      Evaluation of the effect of high-intensity interval training on macular microcirculation via swept-source optical coherence tomography angiography in young football players

      Purpose: This study was conducted to evaluate the effect of high intensity interval training (HIIT) on macular microcirculation, measured by swept source optical coherence tomography angiography (ss OCTA) in young football players. Methods: Football players between 18-20 years old were included. After a detailed ophthalmological examination, physiological parameters, including height, body weight, body fat, systemic blood pressure, hematocrit values, oxygen saturation, and heart rate, were recorded. Intraocular pressure and ss OCTA parameters were measured one day before and the day after the high intensity interval training program using DRI OCT Triton (Topcon, Tokyo, Japan) between 11:00 am and 1 ...

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    3. Role of spectral domain optical coherence tomography in the diagnosis and prognosis of papilledema

      Role of spectral domain optical coherence tomography in the diagnosis and prognosis of papilledema

      Purpose: The study of papilledema with a novel noninvasive technique such as spectral domain-optical coherence tomography (SD-OCT) provides minute and detailed cross-sectional changes thus giving an insight into the application of biomechanical principles and pathophysiology of disc edema. Methods: We measured average retinal nerve fiber layer (RNFL) thickness and the retinal pigment epithelium/Bruch's membrane (RPE/BM) angle at the temporal and nasal borders of the neural canal opening (NCO) in 30 eyes with papilledema, 30 eyes with papillitis, and 80 control eyes. The inward angulation was considered as positive and the outward as negative. Follow-up was done at ...

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    4. A cross-sectional study to determine the normal corneal epithelial thickness in Indian population using 9-mm wide optical coherence tomography scans

      A cross-sectional study to determine the normal corneal epithelial thickness in Indian population using 9-mm wide optical coherence tomography scans

      Purpose: To study the corneal epithelial thickness with 9-mm scans of optical coherence tomography in normal Indians with appropriate representation of all age groups. Methods: This was a cross-sectional observational study. 263 patients were divided into the age groups 5-20 years, 21-35 years, 36-50 years and more than 51 years were recruited for the study. All patients underwent a detailed ophthalmic examination. Patients found to have any ocular surface or intraocular disease condition (except cataract and refractive error), or who had undergone any ophthalmic surgery in the past, or had corneal topography changes suggestive of corneal ectasias (screened in patients ...

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      Mentions: Optovue
    5. Quantified retinal morphology and its association with papilledema and visual acuity in syndromic and complex craniosynostosis: an optical coherence tomography study

      Quantified retinal morphology and its association with papilledema and visual acuity in syndromic and complex craniosynostosis: an optical coherence tomography study

      Purpose This is the first study that evaluates the prevalence of retinal thinning and the correlation with papilledema and visual acuity (VA) in a large craniosynostosis population. Design Prospective clinical cohort study Methods All syndromic and complex craniosynostosis patients who visited the only national referral center between 2018-2020 were included. Retinal layers were segmented using optical coherence tomography (OCT). Patients were seen by an ophthalmologist for VA assessment and fundoscopy. Multivariate regression models were developed to evaluate correlations between retinal thickness, papilledema and VA. Results 127 patients were included. Retinal thinning was most prevalent in the peripapillary retinal nerve fiber ...

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    6. Optical coherence tomographic angiography study of perfusion recovery after surgical lowering of intraocular pressure

      Optical coherence tomographic angiography study of perfusion recovery after surgical lowering of intraocular pressure

      We investigated the time and location of retinal perfusion recovery after surgical intraocular pressure (IOP) lowering in glaucoma by using optical coherent tomography angiography (OCTA). Seventeen patients were analyzed. The 4.5 × 4.5-mm OCTA scans centered on the disc were performed preoperatively and postoperatively at 6 weeks, 3 months, and 6 months. The peripapillary retinal nerve fiber layer (NFL) thickness, NFL plexus capillary density (NFLP-CD) and visual field (VF) were measured overall and in 8 corresponding sectors. The low-perfusion area (LPA) was used to assess the cumulative area where local NFLP-CD was significantly below normal. At 6 months, the ...

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    7. A nonlocal deep image prior model to restore optical coherence tomographic images from gamma distributed speckle noise

      A nonlocal deep image prior model to restore optical coherence tomographic images from gamma distributed speckle noise

      Optical Coherence Tomography (OCT) is often employed to observe the retinal layers in the human eyes. The retinal scans are susceptible to artefacts such as head movements or eye blinks. Along with this, the quality of the images is degraded by speckle noise caused due to the constructive and destructive interference of the waves used for capturing data. Recently, image restoration techniques have geared up in terms of quality with the exertion of deep learning. Despeckling using deep learning, in general, necessitates a large set of training images. On the contrary, deep image prior is a novel model that performs ...

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    8. Oregon Health & Science University Receives NIH Grant for Visible-light OCT angiography, velocimetry, and oximetry for characterizing retinal vascular alterations in glaucoma

      Oregon Health & Science University Receives NIH Grant for Visible-light OCT angiography, velocimetry, and oximetry for characterizing retinal vascular alterations in glaucoma

      Oregon Health & Science University Receives a 2021 NIH Grant for $500,718 for Visible-light OCT angiography, velocimetry, and oximetry for characterizing retinal vascular alterations in glaucoma. The principal investigator is Yali Jia. Below is a summary of the proposed work. Glaucoma damage to the optic nerve and impairment of vision are progressive and irreversible. Understanding mechanisms of glaucomatous injury will help to develop new approaches for treatments that can be used along with traditional therapies that lower intraocular pressure (IOP). Recent developments in optical coherence tomography (OCT) angiography have brought increased attention to the role of the inner retinal circulation ...

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    9. New York University School of Medicine Receives NIH Grant for True Sub-Micron Ocular Diagnostics with Visible Light Optical Coherence Tomography

      New York University School of Medicine Receives NIH Grant for True Sub-Micron Ocular Diagnostics with Visible Light Optical Coherence Tomography

      New York University School of Medicine Receives a 2021 NIH Grant for $468,446 for True Sub-Micron Ocular Diagnostics with Visible Light Optical Coherence Tomography. The principal investigator is Vivek Srinivasan. Below is a summary of the proposed work. The earliest changes in the photoreceptors, retinal pigment epithelium, and Bruch’s membrane in age-related macular degeneration (AMD) are subtle and challenging to detect non-invasively. Here, we will develop and validate a new in vivo imaging technology, visible light Optical Coherence Tomography (OCT), which, if implemented carefully, delineates these layers with unprecedented depth resolution and functional contrast. The ability to precisely ...

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    10. Johns Hopkins University Receives NIH Grant for Enabling technology for image-guided robot-assisted sub-retinal injections

      Johns Hopkins University Receives NIH Grant for Enabling technology for image-guided robot-assisted sub-retinal injections

      Johns Hopkins University Receives a 2021 NIH Grant for $468,446 for Enabling technology for image-guided robot-assisted sub-retinal injections. The principal investigator is Iulian Iordachita. Below is a summary of the proposed work. The goal of this proposal is to design, develop and evaluate a novel clinically compatible surgical platform for enhancing the retina surgeon's ability to provide therapy to the subretinal domain. Efficient, safe, reproducible delivery methods would enable safe and precise delivery of stem cell, nanoparticle and gene therapies for prevalent ocular diseases including but not limited to Age-related Macular Degeneration (AMD). The proposed cooperative surgical robot ...

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    11. Peripapillary Microvascularization Analysis Using Swept-Source Optical Coherence Tomography Angiography in Optic Chiasmal Compression

      Peripapillary Microvascularization Analysis Using Swept-Source Optical Coherence Tomography Angiography in Optic Chiasmal Compression

      Purpose . To evaluate the vessel density (VD) of the radial peripapillary capillary (RPC) network using swept-source optical coherence tomography angiography (SS-OCTA) “en face” images of eyes with chiasmal compression caused by brain tumors before and after decompressive surgery compared with healthy controls. Methods . A cross-sectional study was conducted in 12 patients with chiasmal compression confirmed by neuroimaging. Sixteen healthy participants were also included. All patients with chiasmal compression underwent a neuro-ophthalmological examination one week before and 6 months after brain surgery, including static automated perimetry as well as measurement of the thickness of the retinal nerve fiber layer (RNFL) and ...

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    12. Evaluation of Lacrimal Punctal Changes by Anterior Segment Optical Coherence Tomography AS-OCT After Topical Combined Antibiotics and Steroids Treatment in Cases of Inflammatory Punctual Stenosis

      Evaluation of Lacrimal Punctal Changes by Anterior Segment Optical Coherence Tomography AS-OCT After Topical Combined Antibiotics and Steroids Treatment in Cases of Inflammatory Punctual Stenosis

      Punctal stenosis is an important etiological factor that should be considered when assessing patients with epiphora. Anatomically, acquired punctal stenosis is a condition in which the external opening of the lacrimal canaliculus is narrowed or occluded and also can be accompanied by canalicular ductal stenosis.1,2. Defining an anatomical clear cut-off value for punctal stenosis is difficult due to wide variations in patients' demographics. Clinically, punctal stenosis is defined as a punctum size restricting tear drainage in the absence of distal tear drainage abnormalities.2 Acquired punctal stenosis can be involutional, inflammatory, infectious or idiopathic.3,4 Inflammatory endogenous ...

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    13. Examination of Age-Related Retinal Vascular Changes in the Macula Using Optical Coherence Tomography Angiography of the Eyes After Cataract Surgery

      Examination of Age-Related Retinal Vascular Changes in the Macula Using Optical Coherence Tomography Angiography of the Eyes After Cataract Surgery

      Purpose: Optical coherence tomography angiography (OCTA) allows noninvasive observation of the retinal vasculature, and image analysis can be used to calculate the retinal vessel density and foveal avascular zone (FAZ) area. A previous study showed that macular vessel density and the signal strength index (SSI) of OCTA images increased significantly after cataract surgery. However, the effect of aging on OCTA analysis remains unclear. This study aimed to investigate age-related changes in macular vascularization while excluding the effects of cataracts. Patients and Methods: OCTA imaging of the macula was performed in adult patients who had undergone cataract surgery between February 2018 ...

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    14. Identification and quantification of fibrotic areas in the human retina using polarization-sensitive OCT

      Identification and quantification of fibrotic areas in the human retina using polarization-sensitive OCT

      Subretinal fibrosis is one of the most prevalent causes of blindness in the elderly population, but a true gold standard to objectively diagnose fibrosis is still lacking. Since fibrotic tissue is birefringent, it can be detected by polarization-sensitive optical coherence tomography (PS-OCT). We present a new algorithm to automatically detect, segment, and quantify fibrotic lesions within 3D data sets recorded by PS-OCT. The algorithm first compensates for the birefringence of anterior ocular tissues and then uses the uniformity of the birefringent optic axis as an indicator to identify fibrotic tissue, which is then segmented and quantified. The algorithm was applied ...

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    15. Analysis of correlations between local geographic atrophy growth rates and local OCT angiography-measured choriocapillaris flow deficits

      Analysis of correlations between local geographic atrophy growth rates and local OCT angiography-measured choriocapillaris flow deficits

      The purpose of this study is to quantitatively assess correlations between local geographic atrophy (GA) growth rates and local optical coherence tomography angiography (OCTA)-measured choriocapillaris (CC) flow deficits. Thirty-eight eyes from 27 patients with GA secondary to age-related macular degeneration (AMD) were imaged with a commercial 1050 nm swept-source OCTA instrument at 3 visits, each separated by ∼6 months. Pearson correlations were computed between local GA growth rates, estimated using a biophysical GA growth model, and local OCTA CC flow deficit percentages measured along the GA margins of the baseline visits. The p-values associated with the null hypothesis of ...

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    16. Retinal Neurovascular Structural Changes in Optical Coherence Tomography and the Relationship between These Changes and White Matter Hyperintensities in Patients with Migraine

      Retinal Neurovascular Structural Changes in Optical Coherence Tomography and the Relationship between These Changes and White Matter Hyperintensities in Patients with Migraine

      Introduction: This study aimed to reveal whether retinal nerve fiber layer (RNFL), ganglion cell layer (GCL) inner plexiform layer, and choroidal layer (CL) thicknesses differed in patients with migraine. Optical coherence tomography (OCT) was used to measure these neurovascular structural changes and determine the relationship between these structures and cranial white matter hyperintensities (WMHs). Methods: This retrospective comparative registry study included a total of 155 individuals aged 18–55 (mean, 33.50 ± 8.34), consisting of 110 migraine patients and 45 healthy controls. Results: RNFLs were thinner in the migraine group than the control group but not to a statistically ...

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    17. Gingivitis resolution followed by optical coherence tomography and fluorescence imaging: a case study

      Gingivitis resolution followed by optical coherence tomography and fluorescence imaging: a case study

      Gingivitis is highly prevalent in adults, and if left untreated, can progress to periodontitis. In this paper, we present an interesting case study where the resolution of gingivitis was followed over a period of 10 days using optical coherence tomography (OCT) and light-induced autofluorescence (LIAF). We demonstrate that OCT and its functional angiography can distinctively capture the changes during the resolution of gingivitis; whilst LIAF can detect red-fluorescent signals associated with mature plaque present at the inflamed site. The acute inflammatory region showed evidence of angiogenesis based on the quantification of vessel density and number; while no angiogenesis was detected ...

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    18. An Automated CAD System for Accurate Grading of Uveitis Using Optical Coherence Tomography Images

      An Automated CAD System for Accurate Grading of Uveitis Using Optical Coherence Tomography Images

      Uveitis is one of the leading causes of severe vision loss that can lead to blindness worldwide. Clinical records show that early and accurate detection of vitreous inflammation can potentially reduce the blindness rate. In this paper, a novel framework is proposed for automatic quantification of the vitreous on optical coherence tomography (OCT) with particular application for use in the grading of vitreous inflammation. The proposed pipeline consists of two stages, vitreous region segmentation followed by a neural network classifier. In the first stage, the vitreous region is automatically segmented using a U-net convolutional neural network (U-CNN). For the input ...

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    19. Disease Progression in CNGA3 and CNGB3 Retinopathy; Characteristics of Slovenian Cohort and Proposed OCT Staging Based on Pooled Data from 126 Patients from 7 Studies

      Disease Progression in CNGA3 and CNGB3 Retinopathy; Characteristics of Slovenian Cohort and Proposed OCT Staging Based on Pooled Data from 126 Patients from 7 Studies

      Achromatopsia has been proposed to be a morphologically predominately stable retinopathy with rare reports of progression of structural changes in the macula. A five-grade system of optical coherence tomography (OCT) features has been used for the classification of structural macular changes. However, their association with age remains questionable. We characterized the Slovenian cohort of 12 patients with pathogenic variants in CNGA3 or CNGB3 who had been followed up with OCT for up to 9 years. Based on observed structural changes in association with age, the following four-stage classification of retinal morphological changes was proposed: (I) preserved inner segment ellipsoid band ...

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    20. Toward a New Staging System for Diabetic Retinopathy Using Wide Field Swept-Source Optical Coherence Tomography Angiography

      Toward a New Staging System for Diabetic Retinopathy Using Wide Field Swept-Source Optical Coherence Tomography Angiography

      Purpose of review: For over 50 years, diabetic retinopathy (DR) has been classified by pathologic features seen on clinical examination and conventional retinal photographs. However, newer technology such as optical coherence tomography angiography (OCTA) now enables rapid acquisition of retinal structural and vascular information in a reliable, non-invasive, high-resolution fashion. Here, we highlight recent studies that have explored wide field swept-source OCTA (WF SS-OCTA) for the diagnosis and management of DR. Recent findings: Multiple studies have demonstrated the utility of WF SS-OCTA for detection of all clinically relevant features of DR. An updated DR staging system is proposed that leverages ...

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    21. Hyperreflective Foci, Optical Coherence Tomography Progression Indicators in Age-Related Macular Degeneration, Include Transdifferentiated Retinal Pigment Epithelium

      Hyperreflective Foci, Optical Coherence Tomography Progression Indicators in Age-Related Macular Degeneration, Include Transdifferentiated Retinal Pigment Epithelium

      Purpose: By optical coherence tomography (OCT) imaging, hyperreflective foci (HRF) indicate progression risk for advanced age-related macular degeneration (AMD) and are in part attributable to ectopic retinal pigment epithelium (RPE). We hypothesized that ectopic RPE are molecularly distinct from in-layer cells and that their cross-retinal course follows Müller glia. Methods: In clinical OCT (61 eyes, 44 patients with AMD, 79.4 ± 7.7 years; 29 female; follow-up = 4.7 ± 0.9 years), one HRF type, RPE plume (n = 129 in 4 morphologies), was reviewed. Twenty eyes of 20 donors characterized by ex vivo OCT were analyzed by histology (normal ...

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