1. Articles in category: Ophthalmology

    1-24 of 17487 1 2 3 4 ... 727 728 729 »
    1. Diagnostic accuracy of OCTA and OCT for myopic choroidal neovascularisation: a systematic review and meta-analysis

      Diagnostic accuracy of OCTA and OCT for myopic choroidal neovascularisation: a systematic review and meta-analysis

      Background/objectives: The purpose of this project was to systematically review and meta-analyse studies assessing the diagnostic accuracy of optical coherence tomography angiography (OCTA) and optical coherence tomography (OCT) for myopic choroidal neovascularisation (mCNV). Fluorescein angiography (FA) was accepted as the reference standard. Methods: PUBMED and EMBASE were searched from inception to March 2021 for studies evaluating the test accuracy of OCTA and/or OCT for diagnosing mCNV. The Preferred Reporting Items for Systematic Reviews and Meta-analyses of Diagnostic Test Accuracy Studies guideline was followed, and the Grading of Recommendations, Assessment, Development and Evaluation approach was used to frame clinical ...

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    2. Assessment of optic disk by disk damage likelihood scale staging using slit-lamp biomicroscopy and optical coherence tomography in diagnosing primary open-angle glaucoma

      Assessment of optic disk by disk damage likelihood scale staging using slit-lamp biomicroscopy and optical coherence tomography in diagnosing primary open-angle glaucoma

      Purpose: The current study was aimed at assessment of optic disk by disk damage likelihood scale (DDLS) staging using slit-lamp biomicroscopy and optical coherence tomography (OCT) in diagnosing primary open-angle glaucoma (POAG) patients. Methods: This was a cross-sectional observational study of 106 POAG patients, which was conducted from April 2017 to April 2018. All patients underwent slit-lamp fundoscopy with a +78 D lens and high-definition (HD)-OCT, and the vertical cup disk ratios (VCDRs) were recorded. Disk size and neuroretinal rim assessment were done, and the disk was then staged using the recent version, which stages the optic nerve head ...

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    3. Central macular thickness and subfoveal choroidal thickness changes on spectral domain optical coherence tomography after cataract surgery in pediatric population

      Central macular thickness and subfoveal choroidal thickness changes on spectral domain optical coherence tomography after cataract surgery in pediatric population

      Purpose: To evaluate the central macular thickness (CMT) and subfoveal choroidal thickness (SFCT) changes on spectral domain optical coherence tomography (SD-OCT) after cataract surgery with intraocular lens (IOL) implantation in a pediatric population. Methods: This was a longitudinal, prospective, interventional study which included 90 pediatric patients who underwent cataract extraction with IOL implantation. Serial SD-OCT scans were done at postoperative day 1, 1-month, and 3-month follow-up. CMT and SFCT were measured at each visit. Results: A statistically significant increase in CMT was noted at 1 month (from 199.3 μm to 210.04 μm) post surgery, which declined over a ...

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    4. Anterior segment optical coherence tomography characteristics and management of a unique spectrum of foreign bodies in the cornea and anterior chamber

      Anterior segment optical coherence tomography characteristics and management of a unique spectrum of foreign bodies in the cornea and anterior chamber

      Purpose: To report anterior-segment optical coherence tomography (ASOCT) characteristics of different types of corneal and anterior chamber (AC) foreign bodies (FBs) and their usefulness in diagnosis and management. Methods: This is a retrospective descriptive clinical study involving 11 eyes of 11 patients who presented at the outpatient department of a tertiary ophthalmic care center from January 2017 to January 2022. All patients had a diagnosed or suspected corneal FB. All participants underwent a comprehensive ophthalmological examination, followed by slit-lamp photography and ASOCT. FB removal was done where required by an external, internal, or combined approach. Results: The mean age of ...

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    5. Increase in anterior chamber angle depth after topical pilocarpine measured by spectral domain optical coherence tomography: A possible additional indicator for laser peripheral iridotomy in primary angle-closure suspects in an opportunistic set-up

      Increase in anterior chamber angle depth after topical pilocarpine measured by spectral domain optical coherence tomography: A possible additional indicator for laser peripheral iridotomy in primary angle-closure suspects in an opportunistic set-up

      Purpose: Indication of laser peripheral iridotomy (LPI) is often conjectural due to dependency on gonioscopy and strict dichotomous classification of occludability. Indentation gonioscopy is the gold standard but is under-utilized for various reasons. The prevalence of primary angle closure disease (PACD) in eastern India is 1.5-1.9%, with a 22% five-year progression rate. Many angle closure patients may go blind without timely diagnosis and iridotomy. General ophthalmologists need alternate, validated methods for diagnoses. Pilocarpine eye drop causes miosis, and flattens the iris, producing angle changes detectable by spectral domain optical coherence tomography (SD-OCT). We hypothesized that the amount of ...

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    6. Comparison of peripapillary capillary plexus using optical coherence tomography angiography and retinal nerve fibre layer analysis using spectral domain optical coherence tomography in glaucoma patients, glaucoma suspects, and healthy subjects

      Comparison of peripapillary capillary plexus using optical coherence tomography angiography and retinal nerve fibre layer analysis using spectral domain optical coherence tomography in glaucoma patients, glaucoma suspects, and healthy subjects

      Purpose: To assess the association between radial peripapillary capillary (RPC) plexus using optical coherence tomography angiography (OCTA) and retinal nerve fibre layer (RNFL) thickness using spectral domain OCT (SD-OCT) in primary open-angle glaucoma (POAG) patients, glaucoma suspects, and healthy subjects. Methods: In this single-centre cross-sectional observational study, POAG, glaucoma suspects, and healthy patients underwent OCT-RNFL and optic nerve head angiography scans. The RNFL thickness and the vascular parameters obtained from RPC plexus, including perfusion density (PD), flux index (FI), and vessel density (VD), were analysed. Results: In all, 120 eyes of 120 patients, including 40 POAG patients, 40 glaucoma suspects ...

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    7. Assessment of Tear Meniscus Dimensions Using Anterior Segment Optical Coherence Tomography in Vitamin D Deficiency in a Pediatric Population

      Assessment of Tear Meniscus Dimensions Using Anterior Segment Optical Coherence Tomography in Vitamin D Deficiency in a Pediatric Population

      Background: To investigate of the effect of vitamin D (Vit-D) deficiency on the tear film in children and compare it with that of healthy subjects. Methods: This prospective and cross-sectional study comprised 75 eyes of children who had Vit-D deficiency (Group 1) and 85 eyes of age- and gender-matched healthy children (Group 2). The tear-film break-up time (TF-BUT) and Schirmer test values, as well as the Ocular Surface Disease Index (OSDI) scores were recorded for the participants in all of the groups. Measurement of the tear meniscus area (TMA) and tear meniscus height (TMH) was performed 2 times in the ...

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    8. Diagnostic ability of superficial vascular density measured by optical coherence tomography angiography to differentiate high myopic eyes from eyes with primary open angle glaucoma

      Diagnostic ability of superficial vascular density measured by optical coherence tomography angiography to differentiate high myopic eyes from eyes with primary open angle glaucoma

      Purpose: To determine if high myopia and glaucoma can be differentiated based on the measurement of superficial vascular density in the peripapillary and macular areas by using Optical Coherence Tomography Angiography (OCTA). Methods: This prospective, observational, cross-sectional, comparative study was conducted on patients between 40 and 60 years of age diagnosed as primary open-angle glaucoma (POAG) or high myopia and compared with age-matched controls. The main outcome measures were the difference in SVD% in peripapillary and macular areas in POAG and high myopic eyes. Detailed ophthalmic examination and OCTA of the disc and peripapillary area and macula were performed. The ...

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    9. Functional features in patients with idiopathic macular hole treatment via OCT angiography

      Functional features in patients with idiopathic macular hole treatment via OCT angiography

      To evaluate the optical coherence tomography (OCT) angiography features in patients with idiopathic macular hole (IMH) before and after vitrectomy. This prospective study included 25 patients diagnosed with IMH in Shanxi eye hospital from August 2019 to December 2021. The study was divided into 3 groups: IMH eyes, fellow eyes and normal eyes. All unilateral IMH eyes underwent vitrectomy. There were significant differences in superficial retinal blood flow density (SRBFD, P < .001) and choroidal blood flow density (CBFD) between IMH and healthy control eyes before operation (P < .05). There was significant difference in SRBFD between fellow eyes and normal eyes ...

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    10. RetinAI launches Discovery CORE™: an AI-powered, collaborative platform to accelerate Clinical & Academic Research, & RWE analysis in ophthalmology

      RetinAI launches Discovery CORE™: an AI-powered, collaborative platform to accelerate Clinical & Academic Research, & RWE analysis in ophthalmology

      RetinAI Medical AG (“RetinAI”), a leader in developing software solutions for image processing and artificial intelligence in Ophthalmology, is proud to launch Discovery CORE™ with AI for retinal fluid and layer segmentation. Discovery CORE and its AI models have been designed to accelerate data analysis and help clinical and academic researchers collaborate more efficiently, in real time, with their peers, on medical and imaging datasets. The software measures retinal fluid volumes and layer thickness across OCT datasets automatically in real time. Further, it integrates annotation tools and electronic case report forms, which enable new data insights to be collected across ...

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      Mentions: RetinAI
    11. A moderate dosage of coffee causes acute retinal capillary perfusion decrease in healthy young individuals

      A moderate dosage of coffee causes acute retinal capillary perfusion decrease in healthy young individuals

      im: Caffeinated beverages are very popular across populations and cultures, but quantitative evidence of the acute effects of moderate coffee doses on retinal perfusion is sparse and contradicting. Thus, the aim of this randomized, cross-over and parallel-group design study was to investigate whether moderate consumption of coffee alters macular retinal capillary perfusion in young healthy individuals. Methods: Twenty-seven young healthy individuals were recruited for this study. Acute changes in retinal microvasculature were assessed using spectral-domain optical coherence tomography angiography (SD-OCTA) at baseline, 0.5 h, and 2 h after intake of coffee, or water. Meanwhile, cerebral blood flow (CBF) and ...

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    12. Canadians are Skipping Regular Eye Exams Despite Available Vision Benefits

      Canadians are Skipping Regular Eye Exams Despite Available Vision Benefits

      Canadians who have unused vision benefits are urged to have a comprehensive eye exam before many annual benefits expire at the end of the year as Specsavers data reveals a concerning percentage of Canadians may be at risk for undetected eye disease because of missed eye exam appointments.... As part of Specsavers' commitment to accessible eyecare, and to better facilitate early detection of sight-threatening diseases, Specsavers makes OCT technology available as part of every comprehensive eye exam conducted by independent optometrists at Specsavers locations. The 3D eye scan using OCT technology is non-invasive and only takes a few seconds, allowing ...

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      Mentions: Specsavers
    13. Generative adversarial network-based deep learning approach in classification of retinal conditions with optical coherence tomography images

      Generative adversarial network-based deep learning approach in classification of retinal conditions with optical coherence tomography images

      Purpose: To determine whether a deep learning approach using generative adversarial networks (GANs) is beneficial for the classification of retinal conditions with Optical coherence tomography (OCT) images. Methods: Our study utilized 84,452 retinal OCT images obtained from a publicly available dataset (Kermany Dataset). Employing GAN, synthetic OCT images are produced to balance classes of retinal disorders. A deep learning classification model is constructed using pretrained deep neural networks (DNNs), and outcomes are evaluated using 2082 images collected from patients who visited the Department of Ophthalmology and the Department of Endocrinology and Metabolism at the Tri-service General Hospital in Taipei ...

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    14. Choroidal layer segmentation in OCT images by a boundary enhancement network

      Choroidal layer segmentation in OCT images by a boundary enhancement network

      Morphological changes of the choroid have been proved to be associated with the occurrence and pathological mechanism of many ophthalmic diseases. Optical Coherence Tomography (OCT) is a non-invasive technique for imaging of ocular biological tissues, that can reveal the structure of the retinal and choroidal layers in micron-scale resolution. However, unlike the retinal layer, the interface between the choroidal layer and the sclera is ambiguous in OCT, which makes it difficult for ophthalmologists to identify with certainty. In this paper, we propose a novel boundary-enhanced encoder-decoder architecture for choroid segmentation in retinal OCT images, in which a Boundary Enhancement Module ...

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    15. Optical coherence tomography changes in ankylosing spondylitis patients on long-term adalimumab treatment

      Optical coherence tomography changes in ankylosing spondylitis patients on long-term adalimumab treatment

      OBJECTIVE: Long-term ocular effects of tumor necrosis factor-alpha inhibitors remain to be elucidated. This study aimed to examine the long-term effects of adalimumab use on neural tissue of the anterior visual pathways using optical coherence tomography in patients with ankylosing spondylitis. METHODS: This was a single-center, open-label, cross-sectional study conducted at the Giresun University Faculty of Medicine, Physical Medicine and Rehabilitation Department, between November 2019 and August 2020. This study included 26 ankylosing spondylitis patients receiving adalimumab for at least 1 year and 21 healthy controls. All subjects underwent a full ophthalmological examination and optical coherence tomography examination with the ...

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    16. Ganglion cell complex thickness with spectral domain optical coherence tomography and correlations in a normative pediatric South Asian cohort

      Ganglion cell complex thickness with spectral domain optical coherence tomography and correlations in a normative pediatric South Asian cohort

      Spectral domain optical coherence tomography (SD-OCT) was used to assess the perifoveal Ganglion cell complex (GCC) thickness in healthy Pakistani children. 174 eyes of 87 healthy children (3 to 16 years) were included after a thorough eye examination. Significant refractive error was excluded (>± 5 DS), glaucoma, ocular pathology, intraocular surgery, trauma, and systemic ailments. The perifoveal GCC analysis was done by Optopol Revo 80® high resolution SD-OCT. The average age was 11.1 ± 3.12 years. The average GCC thickness globally was 120.01 ± 76.74 μm, superiorly; 117.51 ± 8.77 μm, superonasally; 120.47 ± 8.78 μm, superotemporally ...

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    17. Asynchronous feature regularization and cross-modal distillation for OCT based glaucoma diagnosis

      Asynchronous feature regularization and cross-modal distillation for OCT based glaucoma diagnosis

      Glaucoma has become a major cause of vision loss. Early-stage diagnosis of glaucoma is critical for treatment planning to avoid irreversible vision damage. Meanwhile, interpreting the rapidly accumulated medical data from ophthalmic exams is cumbersome and resource-intensive. Therefore, automated methods are highly desired to assist ophthalmologists in achieving fast and accurate glaucoma diagnosis. Deep learning has achieved great successes in diagnosing glaucoma by analyzing data from different kinds of tests, such as peripapillary optical coherence tomography (OCT) and visual field (VF) testing. Nevertheless, applying these developed models to clinical practice is still challenging because of various limiting factors. OCT models ...

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    18. Effects of Myopia on Rates of Change in Optical Coherence Tomography Measured Retinal Layer Thicknesses in People with Multiple Sclerosis and Healthy Controls

      Effects of Myopia on Rates of Change in Optical Coherence Tomography Measured Retinal Layer Thicknesses in People with Multiple Sclerosis and Healthy Controls

      Purpose To quantify the associations of myopia with longitudinal changes in retinal layer thicknesses in people with multiple sclerosis (PwMS) and healthy controls (HC). Methods A cohort of PwMS and HC with recorded refractive error (RE) prospectively scanned on Cirrus HD-OCT at the Johns Hopkins MS Center was assessed for inclusion. Exclusion criteria included OCT follow-up < 6 months, ocular comorbidities, incidental OCT pathologies, and inadequate scan quality. Eyes were classified as having high myopia (HM) (RE≤ −6 diopters), low myopia (LM) (RE> −6 and ≤ −3 diopters), or no myopia (NM) (RE> −3 and ≤ +2.75). Linear mixed-effects regression models were ...

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    19. Retinal Pigment Epithelial Changes in Parkinson's Disease: A Spectral Domain Optical Coherence Tomography Study

      Retinal Pigment Epithelial Changes in Parkinson's Disease: A Spectral Domain Optical Coherence Tomography Study

      Objective: To evaluate retinal pigment epithelium (RPE) changes in Parkinson's Disease (PD) and to compare choroidal thickness (CT) and retinal layers with healthy controls. Methods: Parkinson's patients older than 18 and the age-sex match control group were included in this prospective observational study. The neurological and ophthalmological evaluation was performed. All participants were examined by spectral-domain optical coherence tomography. Focal RPE changes were defined as local RPE changes observed in any macula scan. Results: Forty (24 male, mean age 69.2 years) participants were included in the study group, and 44 (24 male, mean age 68.9 years ...

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    20. Prognostic Features of Preoperative Optical Coherence Tomography in Retinal Detachments: A systematic review and meta-analysis

      Prognostic Features of Preoperative Optical Coherence Tomography in Retinal Detachments: A systematic review and meta-analysis

      Topic: To evaluate the prognostic association between preoperative features seen on optical coherence tomography (OCT) imaging and postoperative visual acuity (VA) outcomes in rhegmatogenous retinal detachments (RRD). Clinical relevance: Currently, there is limited literature on the prognostic value of preoperative RRD OCT features. Methods: A literature search was conducted on Ovid MEDLINE, EMBASE and Cochrane CENTRAL from inception through September 15, 2022. A meta-analysis was performed using a random-effects model. Quality of studies and evidence was assessed using the JBI tools and GRADE framework, respectively. Results: A total of 1,671 eyes of 1,670 patients from 29 observational studies ...

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    21. Use of multimodal dataset in AI for detecting glaucoma based on fundus photographs assessed with OCT: focus group study on high prevalence of myopia

      Use of multimodal dataset in AI for detecting glaucoma based on fundus photographs assessed with OCT: focus group study on high prevalence of myopia

      Background: Glaucoma is one of the major causes of blindness; it is estimated that over 110 million people will be affected by glaucoma worldwide by 2040. Research on glaucoma detection using deep learning technology has been increasing, but the diagnosis of glaucoma in a large population with high incidence of myopia remains a challenge. This study aimed to provide a decision support system for the automatic detection of glaucoma using fundus images, which can be applied for general screening, especially in areas of high incidence of myopia. Methods: A total of 1,155 fundus images were acquired from 667 individuals ...

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    22. Characterization of Hyperreflective Dots by Structural and Angiographic Optical Coherence Tomography in Patients with Diabetic Retinopathy and Healthy Subjects

      Characterization of Hyperreflective Dots by Structural and Angiographic Optical Coherence Tomography in Patients with Diabetic Retinopathy and Healthy Subjects

      Hyperreflective dots are a common but highly variable feature of optical coherence tomography (OCT) scans of the retina. We studied the spatial characteristics and perfusion of hyperreflective dots using both structural and angiographic OCT B-scans of the macula in 16 eyes in 8 healthy subjects and 8 patients with diabetic retinopathy without macular edema. Hyperreflective dots were manually graded in a 1000 µm parafoveal area by number, diameter, location and perfusion status and traced through adjacent B-scans at 11 µm intervals to determine their length. Thereby, this study defined a procedure to identify granular and elongated hyperreflective elements and differentiate ...

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    23. Long-Term Follow-Up of Macular Perfusion Evaluated by Optical Coherence Tomography Angiography after Rhegmatogenous Retinal Detachment Surgery

      Long-Term Follow-Up of Macular Perfusion Evaluated by Optical Coherence Tomography Angiography after Rhegmatogenous Retinal Detachment Surgery

      Background: The goal of this study was to investigate macular microvascular changes using optical coherence tomography angiography (OCTA) at one year after successful rhegmatogenous retinal detachment (RRD) surgery. Methods: We performed a cross-section study including RRD treated by pars plana vitrectomy (PPV) with or without scleral buckling and SF6 tamponade. After 12 months, DRI-Triton SS-OCTA was performed. Superficial and deep retinal capillary plexuses (SCP and DCP), choriocapillaris (CC) vessel density (VD), and foveal avascular zone (FAZ) morphology were analyzed. Results were compared with the unaffected contralateral eye. Results: Sixty eyes were included. We observed an increase in VD in the ...

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    24. Optical coherence tomography angiography for the characterisation of retinal microvasculature alterations in pregnant patients with anaemia: a nested case‒control study

      Optical coherence tomography angiography for the characterisation of retinal microvasculature alterations in pregnant patients with anaemia: a nested case‒control study

      Aims: To characterise retinal microvascular alterations in the eyes of pregnant patients with anaemia (PA) and to compare the alterations with those in healthy controls (HC) using optical coherence tomography angiography (OCTA). Methods: This nested case‒control study included singleton PA and HC from the Eye Health in Pregnancy Study. Fovea avascular zone (FAZ) metrics, perfusion density (PD) in the superficial capillary plexus, deep capillary plexus and flow deficit (FD) density in the choriocapillaris (CC) were quantified using FIJI software. Linear regressions were conducted to evaluate the differences in OCTA metrics between PA and HC. Subgroup analyses were performed based ...

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