1. 1-24 of 180 1 2 3 4 5 6 7 8 »
    1. Agreement between anterior segment parameters obtained by a new ultrasound biomicroscopy and a swept-source fourier-domain anterior segment optical coherence tomography

      Agreement between anterior segment parameters obtained by a new ultrasound biomicroscopy and a swept-source fourier-domain anterior segment optical coherence tomography

      Purpose To evaluate the agreement between a new UBM and a SS-OCT. Methods The scans of the right eye of each volunteer were obtained using the 2 devices. Data were fitted and recorded including: central corneal thickness (CCT), aqueous depth (AQD) (the distance from endothelium to lens), angle-to-angle distance (ATA), lens thickness (LT), diameter of the lens in the horizontal direction (LDia angle : distance between the sharp angles on both sides of the lens, LDia arc : distance between the vertex of the circular arcs on both sides of the lens), anterior and posterior corneal radius (Rf and Rb). Results 25 ...

      Read Full Article
    2. Correlation of retinal thickness and swept-source optical coherence tomography angiography derived vascular changes in patients with neovascular age-related macular degeneration

      Correlation of retinal thickness and swept-source optical coherence tomography angiography derived vascular changes in patients with neovascular age-related macular degeneration

      Purpose: The aim of this study was to investigate whether structural OCT changes, in specific retinal thickness, is associated with the vascular response within the nAMD CNV lesion. In other words, whether SSOCTA derived parameters may prove suitable to assess CNV activity in future. Methods: During the first 3 months patients were prospectively followed with visits at days 7, and 14 after each anti-VEGF treatment up to day 90. At baseline, day 30 and 60 Aflibercept was administered. OCT-derrived retinal thickness (RT) and OCTA-derived CNV lesion parameters (vessel area [VA]), total vessel length [TVL], total number of junctions [TNJ], junction ...

      Read Full Article
    3. Long-term follow-up of adult patient with neurofibromatosis type 1 with retinal astrocytic hamartoma using spectral-domain optical coherence tomography: a review of the literature and a report of a case

      Long-term follow-up of adult patient with neurofibromatosis type 1 with retinal astrocytic hamartoma using spectral-domain optical coherence tomography: a review of the literature and a report of a case

      Background : Retinal astrocytic hamartoma (RAH) is a tumor that can be sporadic or in the context of tuberous sclerosis complex (TSC) and has been reported to be associated with neurofibromatosis type 1 (NF1) in a few cases. Patient and methods : A 65-year-old male patient with NF1 was referred for ophthalmological evaluation. Comprehensive examination, near-infrared reflectance (NIR), spectral-domain optical coherence tomography (SDOCT), fluorescein angiography (FFA), and indocyanine green angiography (ICGA) were carried out. The follow-up of the patient was at 4 and 7 years. Results : Best-corrected visual acuity (BCVA) was 20/20 in both eyes. Anterior segment examination revealed bilateral Lisch ...

      Read Full Article
    4. Retinal vascularity, nerve fiber, and ganglion cell layer thickness in thyroid eye disease on optical coherence tomography angiography

      Retinal vascularity, nerve fiber, and ganglion cell layer thickness in thyroid eye disease on optical coherence tomography angiography

      Purpose : To compare the retinal vascularity, peripapillary vascularity, nerve fiber layer thickness and ganglion cell layer thickness between active, inactive thyroid eye disease (TED) and healthy eyes. Methods : Retrospective comparative cross-sectional cohort study. Patients with TED, active and inactive on the VISA score, and healthy eyes were included. All patients underwent optical coherence tomography angiography with detailed demographic and clinical data capture. Using automated software, retinal and peripapillary vascularity index, nerve fiber layer thickness, and ganglion cell layer thickness were calculated and were compared between the groups. Results : Twenty-four eyes with active TED, 102 eyes with inactive TED and 52 ...

      Read Full Article
    5. Optical Coherence Tomography Angiography in Uveitic Glaucoma – A Pilot Study

      Optical Coherence Tomography Angiography in Uveitic Glaucoma – A Pilot Study

      Purpose : To compare vessel density (VD) as measured by optical coherence tomography angiography (OCTA), in uveitic eyes with secondary glaucoma (UG) with VD in uveitic eyes without glaucoma (UV), eyes with primary open-angle glaucoma (POAG), and healthy eyes (HY). Methods : VD was measured at the following segmentation areas: radial peripapillary capillaries, superficial (SL) and deep vascular plexus (DL) and choroid. Results : The majority of the measured papillary areas showed significantly lower VD in the UG group than in the HY group. In macular area, in the superficial vascular plexus wholeVD was significantly lower than in the healthy group, as well ...

      Read Full Article
    6. Quantification of retinal microvascular density using optic coherence tomography angiography in primary angle closure disease

      Quantification of retinal microvascular density using optic coherence tomography angiography in primary angle closure disease

      Purpose : To evaluate the microvascular density of the peripapillary and parafoveal areas of the eyes with primary angle closure disease (PACD) using optical coherence tomography angiography (OCTA). Materials and methods : An observational study was conducted with 76 PACD patients (29 eyes with primary angle closure suspect, 22 eyes with primary angle closure [PAC], and 25 eyes with primary angle closure glaucoma [PACG]) and 27 control eyes. OCTA was performed for all subjects to acquire a 4.5 × 4.5 mm scanning area centered on the optic discs and a 3 × 3 mm parafoveal cubes. Peripapillary and parafoveal vessel density (VD ...

      Read Full Article
    7. Optical coherence tomography confirms shunt malfunction and recurrence of raised intracranial pressure in optic atrophy

      Optical coherence tomography confirms shunt malfunction and recurrence of raised intracranial pressure in optic atrophy

      Background Investigating potential cerebrospinal fluid (CSF) shunt malfunction can be a challenge. Optical coherence tomography (OCT), a non-invasive imaging technique, is used to monitor changes at the optic nerve head in papilloedema. Conventional teaching suggests that in the presence of optic atrophy the optic nerve head may not re-swell in response to a relapse in raised intracranial pressure (ICP). Methods A retrospective case series of three patients who had prior CSF diversion surgery for idiopathic intracranial cranial hypertension (IIH) is presented demonstrating the benefit of non-invasive OCT imaging confirming raised ICP. Results Recurrence of raised ICP, due to malfunctioning CSF ...

      Read Full Article
    8. Diagnostic Value of Optical Coherence Tomography in the Early Diagnosis of Macular Complications in Chronic Vogt-Koyanagi-Harada Disease

      Diagnostic Value of Optical Coherence Tomography in the Early Diagnosis of Macular Complications in Chronic Vogt-Koyanagi-Harada Disease

      Purpose: To describe the role of optical coherence tomography (OCT) in detecting subclinical choroidal inflammation and early diagnosis of macular complications in chronic Vogt-Koyanagi-Harada (VKH) disease with sunset glow fundus. Methods: Retrospective observational study. Clinical features, OCT images, treatment, and visual outcome were analyzed. Results: Fourteen patients (9 females and 5 males) were included in the study. Mean age was 39 years (range 7-67 years). Mean duration of disease was 5.25 years (range 1-15 years). Anterior uveitis was seen in 14 eyes (52%). Fundus examination showed sunset glow fundus in all patients with no obvious macular pathology. OCT showed ...

      Read Full Article
    9. Endoscopic imaging in inflammatory bowel disease: current developments and emerging strategies

      Endoscopic imaging in inflammatory bowel disease: current developments and emerging strategies

      Developments in enhanced and magnified endoscopy have signified major advances in endoscopic imaging of ileocolonic pathology in inflammatory bowel disease (IBD). Artificial intelligence is increasingly being used to augment the benefits of these advanced techniques. Nevertheless, treatment of IBD patients is frustrated by high rates of non-response to therapy, while delayed detection and failures to detect neoplastic lesions impede successful surveillance. A possible solution is offered by molecular imaging, which adds functional imaging data to mucosal morphology assessment through visualizing biological parameters. Other label-free modalities enable visualization beyond the mucosal surface without the need of tracers.

      Read Full Article
    10. Non-invasive Survey of Rubens’ Ceiling Paintings at the Banqueting House Whitehall, London, by Means of Optical Coherence Tomography

      Non-invasive Survey of Rubens’ Ceiling Paintings at the Banqueting House Whitehall, London, by Means of Optical Coherence Tomography

      This article presents the results of the examination by means of optical coherence tomography (OCT) of two of the nine monumental ceiling paintings by Peter Paul Rubens and his studio, still located in their original location at the Banqueting House, the only surviving building of the former Whitehall Palace in London. OCT is a non-invasive technique of structural imaging of layers semi-permeable to infrared light. The aim of the 2018 research campaign at the Banqueting House, conducted within the MOLAB programme under the IPERION CH project, was to determine the present condition of the paintings and thus inform decisions about ...

      Read Full Article
    11. Insights into the Blanching of Water-Damaged Varnish by Means of Spectral-Domain Optical Coherence Tomography

      Insights into the Blanching of Water-Damaged Varnish by Means of Spectral-Domain Optical Coherence Tomography

      In consequence of the flooding of the Loing river in 2016, some of the storage areas for the Musée Girodet were submerged, with 3000 artworks affected. Following this, the painting Le Jeune Trioson (nineteenth century, attributed to the school of Anne-Louis Girodet De Roucy Trioson) developed severe blanching in the varnish, over the dark background in particular. An initial non-contact investigation with a spectral-domain optical coherence tomographic system operating in the near-infrared range (830–1020 nm) gave valuable insights into the development of this alteration. This detected a change in the scattering properties of the blanched varnish compared to ...

      Read Full Article
    12. Usefulness of Polarization-sensitive Optical Coherence Tomography-derived Attenuation-coefficient Images to Visualize the Internal Structure of the Filtering Bleb

      Usefulness of Polarization-sensitive Optical Coherence Tomography-derived Attenuation-coefficient Images to Visualize the Internal Structure of the Filtering Bleb

      Purpose/Aim of the study Polarization-sensitive anterior-segmental optical coherence tomography (PS-OCT) is useful to evaluate the filtering blebs after trabeculectomy. However, the attenuation phenomenon of OCT signal disturbs the visibility of intra-bleb’s structure and distribution of birefringence; a specific parameter of PS-OCT. This study aimed to evaluate the effectiveness of the attenuation-coefficient image of the filtering blebs. Materials and methods This study included 25 eyes 6 months after TLE. The attenuation-coefficient image of blebs was calculated from OCT intensity signal information. The contrast level of the image (reflectivity of bleb’s surface wall/reflectivity of scleral flap) in both ...

      Read Full Article
    13. Evaluation of Significance Maps and the Analysis of the Longitudinal Time Course of the Macular Ganglion Cell Complex Thicknesses in Acquired Occipital Homonymous Hemianopia Using Spectral-domain Optical Coherence Tomography

      Evaluation of Significance Maps and the Analysis of the Longitudinal Time Course of the Macular Ganglion Cell Complex Thicknesses in Acquired Occipital Homonymous Hemianopia Using Spectral-domain Optical Coherence Tomography

      The present study was performed to evaluate the ganglion cell complex (GCC) thickness as well as the significance map and analyse the time course of the change in GCC thickness in patients with homonymous hemianopia due to posterior cerebral artery (PCA) territory stroke using spectral-domain optical coherence tomography. This study included 40 control subjects and 11 patients with unilateral PCA territory stroke. The GCC parameters were quantified using a custom-built software programme. The GCC data, centred on the macula, was divided vertically into hemianopic and unaffected sides. GCC parameters were calculated using an average of those from both eyes. The ...

      Read Full Article
    14. Optical Coherence Tomography Angiography for Evaluation of Retinal Vascular Changes in Patients with Psoriasis according to Disease Severity

      Optical Coherence Tomography Angiography for Evaluation of Retinal Vascular Changes in Patients with Psoriasis according to Disease Severity

      Objectives To investigate foveal avascular zone (FAZ) area and retinal vascular density (VD) in patients with psoriasis according to disease severity using optical coherence tomography angiography (OCTA). Methods Twenty-seven patients with mild psoriasis (Group 1), 28 with moderate to severe psoriasis (Group 2) and 30 healthy controls (Group 3) were evaluated with OCTA. Foveal and parafoveal VD and FAZ area were measured and compared. Results FAZ values were significantly higher in Group 2 (0.20 ± 0.1, 0.31 ± 0.07, 0.20 ± 0.09; P < .001, respectively.). The mean VD value were significantly lower in the deep capillary plexus ...

      Read Full Article
    15. Are Retinal and Peripapillary Blood Flows Affected during Migraine Attack?

      Are Retinal and Peripapillary Blood Flows Affected during Migraine Attack?

      Migraine pathophysiology is complex and partially includes the vasculature. This study compared retinal and peripapillary blood flow parameters in migraine patients during an attack with healthy controls using optical coherence tomography angiography (OCTA). A prospective clinical study was conducted including 52 eyes from 26 migraineurs and 48 eyes from 24 healthy controls. OCTAs were performed with RTVue XR Avanti using AngioVue software. OCTA imaging was performed during the attack period in migraineurs before any treatment for the attack. Vascular densities in the whole image, fovea, superior hemisphere, inferior hemisphere, and temporal, superior, nasal, and inferior regions of the parafoveal area ...

      Read Full Article
    16. Evaluation of Macular Thickness and Visual Pathways Using Optic Coherence Tomography and Pattern Visual Evoked Potential in Different Clinical Stages of Obstructive Sleep Apnea Syndrome

      Evaluation of Macular Thickness and Visual Pathways Using Optic Coherence Tomography and Pattern Visual Evoked Potential in Different Clinical Stages of Obstructive Sleep Apnea Syndrome

      AIM: The present study aimed to investigate and compare possible changes in amplitude and latency of pattern visual evoked potentials (PVEP) and thickness of quadrants of the macula (TQM) using optic coherence tomography (OCT). MATERIALS AND METHODS: According to polysomnography examinations, 30 mild, 30 severe, 30 controls were included in the study after approval from the ethics committee. RESULTS: No significant difference was found in age and gender between the groups (p = 0.184 and p = 0.954). Significant difference was found between external and internal superior TQM, mean thickness of ganglion cell layer in comparison of all three groups ...

      Read Full Article
    17. Evaluation of Retinal Vascularization by Optical Coherence Tomography Angiography (OCTA) in Rheumatoid Arthritis, and Its Relationship with Disease Activity

      Evaluation of Retinal Vascularization by Optical Coherence Tomography Angiography (OCTA) in Rheumatoid Arthritis, and Its Relationship with Disease Activity

      Purpose: To measure the retinal capillary density quantitatively with optical coherence tomography angiography (OCTA) in patients with rheumatoid arthritis (RA) and healthy controls (HCs), and to evaluate the relationship between OCTA findings and RA disease activity. Methods: In this cross-sectional study 106 eyes of RA patients and 71 eyes of healthy controls (HCs) were evaluated. RA patients were divided into inactive (DAS28 < 3.2) and active (DAS28 ≥ 3.2) subgroups. Retinal capillary plexus density (CPD) was obtained from the superficial capillary plexus (SCP), deep capillary plexus (DCP), and radial peripapillary capillaries (RPC). Results: In RA patients and HCs, the CPD ...

      Read Full Article
    18. Trends in optical coherence tomography angiography use in university clinic and private practice setting between 2014-2018

      Trends in optical coherence tomography angiography use in university clinic and private practice setting between 2014-2018

      Background The aim was to assess the trends in optical coherence tomography angiography (OCTA) use compared with fluorescein angiography (FA). Methods A bilateral patient’s exam on a single day was considered one examination. A total of 3680 and 700 OCTA examinations and 3387 and 439 FA examinations were performed between 2014 and 2018 in a university clinic and private practice, respectively. A regression analysis was completed. Results The use of OCTA procedures grew 17-fold from 2015 till 2018. In a university clinic, ultrawide-field FA accounted for 2% of all FA examinations performed in 2015, and its use increased to ...

      Read Full Article
    19. Subclinical retinal angiopathy associated with hereditary transthyretin amyloidosis – assessed with optical coherence tomography angiography

      Subclinical retinal angiopathy associated with hereditary transthyretin amyloidosis – assessed with optical coherence tomography angiography

      Background Retinal angiopathy is a known ocular manifestation of hereditary transthyretin amyloidosis (ATTRv). Optical coherence tomography angiography (OCT-A) is a recent noninvasive imaging technique, used in other retinal vascular diseases. Our purpose was to analyse subclinical changes in retinal vessels, with OCT-A, in patients with ATTRv amyloidosis. Methods Observational cross-sectional study in Centro Hospitalar e Universitário do Porto in the cohort of patients with genetic diagnosis of ATTRv. Patients were included if they had just one eye with scalloped iris (the other eye without scalloped iris), postulating eyes were at different stages, in the same patient. Patients were excluded ...

      Read Full Article
    20. Anterior Segment Inflammation in Pediatric Uveitis Is Associated with Reduced Retinal Vascular Density as Quantified by Optical Coherence Tomography Angiography

      Anterior Segment Inflammation in Pediatric Uveitis Is Associated with Reduced Retinal Vascular Density as Quantified by Optical Coherence Tomography Angiography

      Purpose To analyze the retinal capillary vascular density (VD) as quantified by optical coherence tomography angiography (OCTA) in patients with pediatric uveitis. Methods OCTA images of 32 pediatric uveitis patients and 30 normal controls (NC) were obtained retrospectively. The foveal avascular zone (FAZ) area, VDs in the superficial capillary plexus (SCP) and deep capillary plexus (DCP), the central macular thickness (CMT), and subfoveal choroidal thickness (SFCT) were analyzed and compared between active and quiescent uveitic eyes, contralateral eyes and NC eyes. Results Compared with NCs, the VDs in the SCP and DCP were significantly reduced in eyes with both active ...

      Read Full Article
    21. Quantitative Analysis of the Iris Surface Smoothness by Anterior Segment Optical Coherence Tomography in Fuchs Uveitis

      Quantitative Analysis of the Iris Surface Smoothness by Anterior Segment Optical Coherence Tomography in Fuchs Uveitis

      Objective: To demonstrate the value of "smoothness index (SI)" as a novel tool for quantitative analysis of iris surface findings in unilateral Fuchs' uveitis (FU). Methods: Both phakic eyes from patients with unilateral FU as well as healthy control subjects underwent anterior segment optical coherence tomography (AS-OCT). The ImageJ software was used for calculating the SI. Results: Forty eyes from 20 patients with unilateral FU and 40 eyes from 20 healthy subjects were enrolled. In FU eyes, mean overall SI (0.876 ± 0.030) was significantly higher than fellow control eyes (0.841 ± 0.041) ( p = .001). Mean inter-eye difference ...

      Read Full Article
    22. Uveitis as a Confounding Factor in Retinal Nerve Fiber Layer Analysis Using Optical Coherence Tomography

      Uveitis as a Confounding Factor in Retinal Nerve Fiber Layer Analysis Using Optical Coherence Tomography

      Purpose To investigate the retinal nerve fiber layer thickness (RNFLT) in uveitic eyes and search for the associations with uveitis activity, etiology and location. Methods The files of 76 patients with uveitis and 76 controls were scanned. Associations of RNFLT were analyzed using generalized linear models. Results The RNFLT was significantly higher in patients with uveitis ( p < .001). Active uveitis patients had a thicker RNFL than the controls and the patients with quiescent uveitis ( p < .001). Anterior uveitis was associated with thinner RNFL in global and inferotemporal quadrant ( p = .011 and 0.013, respectively). Thickening of RNFL was associated with ...

      Read Full Article
    23. Recent advances in imaging technologies for assessment of retinal diseases

      Recent advances in imaging technologies for assessment of retinal diseases

      Introduction Retinal imaging is a key investigation in ophthalmology. New devices continue to be created to keep up with the demand for better imaging modalities in this field. This review looks to highlight current trends and the future of retinal imaging. Areas covered This review looks at the advances in topographical imaging, photoacoustic microscopy, optical coherence tomography and molecular imaging. There is future scoping Expert opinion Retinal imaging continues to develop at a rapid pace to improve diagnosis and management of patients. We will see the development of big data to gain powerful insights and new technologies such as teleophthalmology ...

      Read Full Article
    24. Assessment of anterior segment measurements using a high-resolution imaging device

      Assessment of anterior segment measurements using a high-resolution imaging device

      Purpose To assess repeatability of several anterior segment parameters obtained with swept-source optical coherence tomography (SS-OCT). Methods We measured 5-times consequently several parameters in 69 eyes using the ANTERION SS-OCT. White-to-white (WTW), angle-to-angle (ATA), spur-to-spur (STS) and lens vault distances were measured in the horizontal- and vertical-meridian. Anterior-chamber-angle (ACA), scleral-spur-angle (SSA), angle-opening-distance (AOD) and trabecular-iris-space-area (TISA) were measured at 500 and 750 μm for the superior, nasal, inferior and temporal quadrants. Intrasubject standard deviation (S w ), coefficient of variation (CoV), coefficient of repeatability (CoR) and intraclass correlation coefficient (ICC) were calculated for each parameter. Bland-Altman analysis was done. Results We ...

      Read Full Article
    1-24 of 180 1 2 3 4 5 6 7 8 »
  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