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Retinal image analysis

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https://www.readbyqxmd.com/read/29772043/foveal-avascular-zone-area-analysis-in-macular-hole-before-and-after-surgery-using-optical-coherence-tomography-angiography
#1
Ferdiriva Hamzah, Ari Shinojima, Hiroyuki Nakashizuka, Akiyo Kawamorita, Hiroyuki Shimada
BACKGROUND AND OBJECTIVE: To analyze the foveal avascular zone (FAZ) area in superficial and deep retinal layers in patients with macular hole (MH) before and after surgery. PATIENTS AND METHODS: The authors studied 14 patients with unilateral MH. They examined a 3 mm × 3 mm area at the fovea before and 6 months after surgery using spectral-domain optical coherence tomography angiography. RESULTS: In eyes affected by MH, the mean preoperative superficial FAZ (0...
May 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29772039/five-year-outcomes-of-surgically-treated-symptomatic-epiretinal-membranes-with-and-without-internal-limiting-membrane-peeling
#2
Harris Sultan, Charles C Wykoff, Ankoor R Shah
BACKGROUND AND OBJECTIVE: The authors evaluated long-term postoperative visual outcomes and recurrence rates following surgery for symptomatic epiretinal membrane (ERM) ± internal limiting membrane (ILM) peeling. PATIENTS AND METHODS: This was a retrospective, consecutive case series of 78 patients undergoing vitrectomy for symptomatic ERM between 1/2010 and 4/2012 with follow-up through at least postoperative year 5 (POY5). Outcomes included visual acuity (VA) (Snellen VA converted to logMAR), central retinal thickness (CRT; μm), and ERM recurrence...
May 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29770594/functional-optical-coherence-tomography-of-neurovascular-coupling-interactions-in-the-retina
#3
Taeyoon Son, Minhaj Alam, Devrim Toslak, Benquan Wang, Yiming Lu, Xincheng Yao
Quantitative evaluation of retinal neurovascular coupling is essential for a better understanding of visual function and early detection of eye diseases. However, there is no established method to monitor coherent interactions between stimulus-evoked neural activity and hemodynamic responses at high resolution. Here we report a multi-modal functional optical coherence tomography (OCT) imaging methodology to enable concurrent intrinsic optical signal (IOS) imaging of stimulus-evoked neural activity and hemodynamic responses at capillary resolution...
May 16, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29763583/m%C3%A3-ller-glial-cells-contribute-to-dim-light-vision-in-the-spectacled-caiman-caiman-crocodilus-fuscus-analysis-of-retinal-light-transmission
#4
Silke Agte, Alexey Savvinov, Anett Karl, Astrid Zayas-Santiago, Elke Ulbricht, Vladimir I Makarov, Andreas Reichenbach, Andreas Bringmann, Serguei N Skatchkov
In this study, we show the capability of Müller glial cells to transport light through the inverted retina of reptiles, specifically the retina of the spectacled caimans. Thus, confirming that Müller cells of lower vertebrates also improve retinal light transmission. Confocal imaging of freshly isolated retinal wholemounts, that preserved the refractive index landscape of the tissue, indicated that the retina of the spectacled caiman is adapted for vision under dim light conditions. For light transmission experiments, we used a setup with two axially aligned objectives imaging the retina from both sides to project the light onto the inner (vitreal) surface and to detect the transmitted light behind the retina at the receptor layer...
May 12, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29762268/influence-of-removing-the-large-retinal-vessels-related-effect-on-peripapillary-vessel-density-progression-analysis-in-glaucoma
#5
Gábor Holló
PURPOSE: To investigate the usefulness of removing the large vessel-related information from peripapillary optical coherence tomography (OCT) angiography progression analysis. Peripapillary vessel density (VD) image series which had shown no progression with an earlier software version that did not separate capillary and large vessel-related effects were reevaluated for selective peripapillary capillary VD progression. METHODS: Prospective retinal nerve fiber layer thickness (RNFLT) and peripapillary VD measurements were made using the Angiovue/RTvue-XR OCT on one eye of 9 normal, 20 under treatment ocular hypertensive (OHT) and 24 under treatment open-angle glaucoma patients at 6-month intervals for 2 years (5 visits)...
May 12, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29760993/assessing-blood-vessel-perfusion-and-vital-signs-through-retinal-imaging-photoplethysmography
#6
Harnani Hassan, Sheila Jaidka, Vincent M Dwyer, Sijung Hu
One solution to the global challenge of increasing ocular disease is a cost-effective technique for rapid screening and assessment. Current ophthalmic imaging techniques, e.g. scanning and ocular blood flow systems, are expensive, complex to operate and utilize invasive contrast agents during assessment. The work presented here demonstrates a simple retinal imaging photoplethysmography (iPPG) system with the potential to provide screening, diagnosis, monitoring and assessment that is non-invasive, painless and radiationless...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29757052/multimodal-characterization-of-a-novel-mutation-causing-vitamin-b6-responsive-gyrate-atrophy
#7
Xuan Cui, Ruben Jauregui, Karen Sophia Park, Stephen H Tsang
PURPOSE: Gyrate atrophy (GA) is a rare chorioretinal degeneration that results in the deterioration of night and peripheral vision, eventually leading to blindness. The disorder is caused by mutations in the gene encoding ornithine aminotransferase (OAT), causing increased levels of plasma ornithine. Treatment revolves around lowering plasma ornithine levels, with vitamin B6 supplementation being the preferred treatment. Nevertheless, most patients do not respond to this therapy. Here, we report a rare case of vitamin B6-responsive GA caused by a novel mutation in OAT and characterize the presentation with multimodal imaging...
May 14, 2018: Ophthalmic Genetics
https://www.readbyqxmd.com/read/29750949/automated-beta-zone-parapapillary-area-measurement-to-differentiate-between-healthy-and-glaucoma-eyes
#8
Patricia Isabel C Manalastas, Akram Belghith, Robert N Weinreb, Jost B Jonas, Min Hee Suh, Adeleh Yarmohammadi, Felipe A Medeiros, Christopher A Girkin, Jeffrey M Liebmann, Linda M Zangwill
PURPOSE: To evaluate whether automated assessment of beta-zone parapapillary atrophy (ßPPA) area can differentiate between glaucomatous and healthy eyes of varying axial lengths (AL). DESIGN: Cross-sectional study. METHODS: ßPPA was automatically identified in glaucoma and healthy eyes with enhanced depth imaging optical coherence tomography (OCT) optic nerve head (ONH) radial B-scans. Associations with AL and the presence of glaucoma were assessed...
May 8, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29750948/altered-macular-microvasculature-in-neuromyelitis-optica-spectrum-disorders
#9
William Robert Kwapong, Chenlei Peng, Zhiyong He, Xiran Zhuang, Meixiao Shen, Fan Lu
PURPOSE: To evaluate macular microvascular changes in neuromyelitis optica spectrum disorders (NMOSD) by using optical coherence tomography angiography (OCT-A) and investigate their correlations with neuroaxonal structural damage evaluated with Spectral domain OCT (SD-OCT). DESIGN: Cross-sectional study. METHODS: Twenty eyes of 20 patients with NMOSD and 21 eyes from 21 healthy controls were enrolled. OCT-A was used to obtain microvascular network images of the whole, superficial, and deep retinal capillary plexuses (WRCP, SRCP, and DRCP) in a 3-mm diameter area around the macula...
May 8, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29750714/non-invasive-detection-of-mitochondrial-dysfunction-in-ocular-hypertension-and-primary-open-angle-glaucoma
#10
Lawrence S Geyman, Yanin Suwan, Reena Garg, Matthew G Field, Brian D Krawitz, Shelley Mo, Alexander Pinhas, Robert Ritch, Richard B Rosen
PURPOSE: To assess mitochondrial dysfunction in vivo in ocular hypertension (OHT) and primary open-angle glaucoma (POAG) using retinal metabolic analysis. PATIENTS AND METHODS: This was an observational, cross-sectional study performed from November 2015 to October 2016 at the New York Eye and Ear Infirmary of Mount Sinai. Thirty-eight eyes with varying stages of POAG, 16 eyes with OHT, and 32 control eyes were imaged on a custom fundus camera modified to measure full retinal thickness fluorescence at a wavelength optimized to detect flavoprotein fluorescence (FPF)...
May 10, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29749514/proteomic-analysis-of-chick-retina-during-early-recovery-from-lens%C3%A2-induced-myopia
#11
Yun Yun Zhou, Rachel Ka Man Chun, Jian Chao Wang, Bing Zuo, King Kit Li, Thomas Chuen Lam, Quan Liu, Chi-Ho To
Myopia development has been extensively studied from different perspectives. Myopia recovery is also considered important for understanding the development of myopia. However, despite several previous studies, retinal proteomics during recovery from myopia is still relatively unknown. Therefore, the aim of the present study was to investigate the changes in protein profiles of chicken retinas during early recovery from lens‑induced myopia to evaluate the signals involved in the adjustment of this refractive disorder...
May 3, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29747355/-analysis-on-the-clinical-and-retinal-imaging-characteristics-of-autosomal-recessive-bestrophinopathy
#12
Q Li, X Y Peng, X N Wang, Y Li, L Tian
Objective: To study the clinical and imaging features of autosomal recessive bestrophinopathy (ARB). Methods: Retrospective study. The clinical and imaging data of 14 participants were analyzed in using autofluorescence (AF), fluorescein angiography (FA) and spectral-domain optical coherence tomography (SD-OCT). Ten patients were screened for mutations in BEST1 gene. Results: Retinopathy of ARB were shown as bilaterally and circularly distributed yellow subretinal deposits in the mid-peripheral and posterior retina, which was observed more clearly by AF and FA...
April 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29743194/obesity-blood-pressure-and-retinal-vessels-a-meta-analysis
#13
REVIEW
Sabrina Köchli, Katharina Endes, Denis Infanger, Lukas Zahner, Henner Hanssen
CONTEXT: Retinal vessel imaging is a noninvasive diagnostic tool used to evaluate cardiovascular risk. Childhood obesity and elevated blood pressure (BP) are associated with retinal microvascular alterations. OBJECTIVE: To systematically review and meta-analyze associations between obesity, BP, and physical activity with retinal vessel diameters in children. DATA SOURCES: We conducted a literature search through the databases of PubMed, Embase, Ovid, Web of Science, and the Cochrane Register of Controlled Trials...
May 9, 2018: Pediatrics
https://www.readbyqxmd.com/read/29738542/microvascular-retinopathy-and-angiographically-demonstrated-coronary-artery-disease-a-cross-sectional-observational-study
#14
Lisa Cheng, Peter Barlis, Joel Gibson, Deb Colville, Anastasia Hutchinson, Geoff Gleeson, Ecosse Lamoureux, William VanGaal, Judy Savige
Epidemiological studies suggest retinal microvascular abnormalities predict cardiac events. This study examined microvascular features associated with coronary artery abnormalities. This was a single-centre, cross-sectional, observational study of 144 consecutive subjects undergoing coronary angiography for clinical indications. Their angiograms were deidentified and graded for disease (Leaman score, LAD stenosis ≥ 70%, number of vessels stenosed ≥ 70%), and Thrombolysis in Myocardial Infarction (TIMI) blush score...
2018: PloS One
https://www.readbyqxmd.com/read/29736941/two-dimensional-simulation-of-eccentric-photorefraction-images-for-ametropes-factors-influencing-the-measurement
#15
Yifei Wu, Larry N Thibos, T Rowan Candy
PURPOSE: Eccentric photorefraction and Purkinje image tracking are used to estimate refractive state and eye position simultaneously. Beyond vision screening, they provide insight into typical and atypical visual development. Systematic analysis of the effect of refractive error and spectacles on photorefraction data is needed to gauge the accuracy and precision of the technique. METHODS: Simulation of two-dimensional, double-pass eccentric photorefraction was performed (Zemax)...
May 7, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29736326/evaluation-of-a-qualitative-approach-for-detecting-glaucomatous-progression-using-wide-field-optical-coherence-tomography-scans
#16
Zhichao Wu, Denis S D Weng, Rashmi Rajshekhar, Abinaya Thenappan, Robert Ritch, Donald C Hood
Purpose: To determine the effectiveness of detecting glaucomatous progression by a qualitative evaluation of wide-field (12 × 9 mm) scans on optical coherence tomography imaging. This method was compared to a conventional quantitative analysis of the global circumpapillary retinal nerve fiber layer (cpRNFL) thickness. Methods: A total of 409 eyes with a clinical diagnosis of glaucoma or suspected glaucoma for which two wide-field scans were obtained at least 1 year apart ( n = 125) and within one session ( n = 284) were included to determine the sensitivity of detecting progression at 95% specificity...
May 2018: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29728242/macula-segmentation-and-fovea-localization-employing-image-processing-and-heuristic-based-clustering-for-automated-retinal-screening
#17
GeethaRamani R, Lakshmi Balasubramanian
BACKGROUND AND OBJECTIVE: Macula segmentation and fovea localization is one of the primary tasks in retinal analysis as they are responsible for detailed vision. Existing approaches required segmentation of retinal structures viz. optic disc and blood vessels for this purpose. METHOD: This work avoids knowledge of other retinal structures and attempts data mining techniques to segment macula. Unsupervised clustering algorithm is exploited for this purpose. Selection of initial cluster centres has a great impact on performance of clustering algorithms...
July 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29726494/what-is-a-troland
#18
Larry N Thibos, Norberto Lopez-Gil, Arthur Bradley
Trolands are a widely used measure of retinal illuminance in vision science and visual optics, but disagreements exist for the definition and interpretation of this photometric unit. The purpose of this communication is to resolve the confusion by providing a sound conceptual basis for interpreting trolands as a measure of angular flux density incident upon the retina. Using a simplified optical analysis, we show that the troland value of an extended source is the intensity in micro-candelas of an equivalent point source located at the eye's posterior nodal point that produces the same illuminance in the retinal image as does the extended source...
May 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29721941/a-novel-approach-for-integrating-af-slo-and-sdoct-imaging-data-demonstrates-the-ability-to-identify-early-retinal-abnormalities-in-mutant-mice-and-evaluate-the-effects-of-genetic-and-pharmacological-manipulation
#19
Brent A Bell, Vera L Bonilha, Ivy S Samuels
Noninvasive ocular imaging platforms are undeniably useful in identifying retinal abnormalities. The purpose of this study was to investigate a novel method for integrating information acquired from two independent imaging platforms, AF-SLO and SDOCT, in order to demonstrate retinal perturbations as a result of genetic or pharmacological manipulation. Two cohorts of mice were investigated, Nyx nob and C57BL/6 J. In Nyx nob mice, SLO revealed an atypical but variable amount of autofluorescent foci (AFF); SDOCT showed altered photoreceptor outer segment architecture...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29721939/repeatability-and-reproducibility-of-in-vivo-cone-density-measurements-in-the-adult-zebrafish-retina
#20
Alison Huckenpahler, Melissa Wilk, Brian Link, Joseph Carroll, Ross Collery
Zebrafish (Danio rerio) are widely used as an experimental model for a wide range of retinal diseases. Previously, optical coherence tomography (OCT) was introduced for quantitative analysis of the zebrafish cone photoreceptor cell mosaic; however no data exists on the intersession reproducibility or intrasession repeatability of such measurements. We imaged 14 wild-type (WT) fish three times each, with 48 h between each time point. En face images of the UV cone mosaic were generated from the OCT volume scans at each time point...
2018: Advances in Experimental Medicine and Biology
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