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https://www.readbyqxmd.com/read/28227682/development-of-ocular-viscosity-characterization-method
#1
Shu-Hao Lu, Guo-Zhen Chen, Stanley Y Y Leung, David C C Lam, Shu-Hao Lu, Guo-Zhen Chen, Stanley Y Y Leung, David C C Lam, David C C Lam, Shu-Hao Lu, Guo-Zhen Chen, Stanley Y Y Leung
Glaucoma is the second leading cause for blindness. Irreversible and progressive optic nerve damage results when the intraocular pressure (IOP) exceeds 21 mmHg. The elevated IOP is attributed to blocked fluid drainage from the eye. Methods to measure the IOP are widely available, but methods to measure the viscous response to blocked drainage has yet been developed. An indentation method to characterize the ocular flow is developed in this study. Analysis of the load-relaxation data from indentation tests on drainage-controlled porcine eyes showed that the blocked drainage is correlated with increases in ocular viscosity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227476/a-smartphone-based-system-for-assessing-intraocular-pressure
#2
A Mariakakis, E Wang, S Patel, J C Wen, A Mariakakis, E Wang, S Patel, J C Wen, E Wang, A Mariakakis, S Patel, J C Wen
The measurement of intraocular pressure (IOP) is an important vital sign for the eye, particularly for the diagnosis of glaucoma. Procedures for measuring IOP have been used by eye care professionals for over 100 years, but those without access to such professionals often go undiagnosed. We present a smartphone-based system that can be operated by minimally trained users to measure IOP. The system emulates fixed-force tonometry using a low-cost mechanical attachment to the smartphone. Video is captured through the attachment and then processed in real-time to provide an absolute estimate of the patient's intraocular pressure...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227442/low-cost-rapid-prototyping-of-liquid-crystal-polymer-based-magnetic-microactuators-for-glaucoma-drainage-devices
#3
Hyunsu Park, Simon John, Hyowon Lee, Hyunsu Park, Simon John, Hyowon Lee, Simon John, Hyowon Lee, Hyunsu Park
Glaucoma is one of the leading causes of blindness in the world. Although there is no cure for glaucoma, pharmaceutical or surgical interventions are known to delay the progression of this debilitating disease. In recent years, implantation of glaucoma drainage devices (GDD) have increased due to their ability to manage IOP better than other therapeutic approaches. However, only 50% of the implanted devices remain functional after 5 years often due to biofouling. Here, we report our latest progress towards developing self-clearing GDDs using integrated magnetic microactuators...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227403/abnormal-interhemispheric-resting-state-functional-connectivity-in-primary-open-angle-glaucoma
#4
Peng Zhou, Jieqiong Wang, Ting Li, Ningli Wang, Junfang Xian, Huiguang He, Peng Zhou, Jieqiong Wang, Ting Li, Ningli Wang, Junfang Xian, Huiguang He, Ningli Wang, Junfang Xian, Huiguang He, Ting Li, Jieqiong Wang, Peng Zhou
Glaucoma is the second leading cause of blindness and it has been the topic of massive studies to explore the underlying mechanisms of the disease. Resting-state neuroimaging studies have been widely applied to investigate the functional damage of the brain, but little is known about the alterations of the interhemispheric resting-state functional connectivity (RSFC) in patients with primary open-angle glaucoma (POAG). In the present study, we used a newly developed voxel-mirrored homotopic connectivity (VMHC) method to explore the interhemispheric RSFC of the brain in POAG patients...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227213/segmentation-of-optic-disc-and-optic-cup-in-retinal-fundus-images-using-shape-regression
#5
Suman Sedai, Pallab K Roy, Dwarikanath Mahapatra, Rahil Garnavi, Suman Sedai, Pallab K Roy, Dwarikanath Mahapatra, Rahil Garnavi, Suman Sedai, Pallab K Roy, Rahil Garnavi, Dwarikanath Mahapatra
Glaucoma is one of the leading cause of blindness. The manual examination of optic cup and disc is a standard procedure used for detecting glaucoma. This paper presents a fully automatic regression based method which accurately segments optic cup and disc in retinal colour fundus image. First, we roughly segment optic disc using circular hough transform. The approximated optic disc is then used to compute the initial optic disc and cup shapes. We propose a robust and efficient cascaded shape regression method which iteratively learns the final shape of the optic cup and disc from a given initial shape...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226748/integrating-holistic-and-local-deep-features-for-glaucoma-classification
#6
Annan Li, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Annan Li, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Jun Cheng, Damon Wing Kee Wong, Jiang Liu, Annan Li
Automated glaucoma detection is an important application of retinal image analysis. Compared with segmentation based approaches, image classification based approaches have a potential of better performance. However, it still remains a challenging problem for two reasons. Firstly, due to insufficient sample size, learning effective features is difficult. Secondly, the shape variations of optic disc introduce misalignment. To address these problem, a new classification based approach for glaucoma detection is proposed, in which deep convolutional networks derived from large-scale generic dataset is used to representing the visual appearance and holistic and local features are combined to mitigate the influence of misalignment...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226738/automatic-anterior-chamber-angle-structure-segmentation-in-as-oct-image-based-on-label-transfer
#7
Huazhu Fu, Yanwu Xu, Damon Wing Kee Wong, Jiang Liu, Mani Baskaran, Shamira A Perera, Tin Aung, Huazhu Fu, Yanwu Xu, Damon Wing Kee Wong, Jiang Liu, Mani Baskaran, Shamira A Perera, Tin Aung, Mani Baskaran, Tin Aung, Huazhu Fu, Yanwu Xu, Damon Wing Kee Wong, Jiang Liu, Shamira A Perera
The anterior chamber angle (ACA) plays an important role for diagnosis and treatment of angle-closure glaucoma. Anterior Segment Optical Coherence Tomography (AS-OCT) imaging is qualitative and quantitative assessment for the ACA structure. In this paper, we propose a novel fully automatic segmentation method for anterior chamber angle structure in AS-OCT. In our method, the initial labels are obtained by using label transfer from the AS-OCT reference dataset. Then, these labels are refined and utilized as the landmarks to support the structure segmentation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226599/identifying-glaucoma-patients-by-applying-multivariate-analyses-of-cardiovascular-signals
#8
Andreas Voss, Claudia Fischer, Cristina Gonzalez Martinez, Eva Koch, Niklas Plange, Kathleen Kunert, Andreas Voss, Claudia Fischer, Cristina Gonzalez Martinez, Eva Koch, Niklas Plange, Kathleen Kunert, Claudia Fischer, Kathleen Kunert, Niklas Plange, Cristina Gonzalez Martinez, Eva Koch, Andreas Voss
Glaucoma is a disease that damages the eye's optic nerve. However, the exact cause of this optic nerve damage is not yet fully understood. Besides the factors of age, genetics and others, such as obesity, medication and migraines, a vascular dysfunction is believed to be a significant factor leading to glaucoma. This study's objective was to investigate whether these vascular dysfunctions could be recognized by analyzing cardiovascular regulation in glaucoma patients. Linear and nonlinear methods were applied to the extracted heart rate (HR), and systolic/ diastolic blood pressure (DBP) time series to discriminate between 35 healthy controls and 20 glaucoma patients...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226388/-can-anti-vegf-injections-cause-glaucoma-or-ocular-hypertension
#9
I Lanzl, K Kotliar
An increasing number of patients receive intravitreal anti-vascular endothelial growth factor (anti-VEGF) injections with a high frequency for the treatment of neovascular macular disease. Since the volume of the vitreous body is temporarily increased by the injection of the substances, a short-term intraocular pressure increase after the introduction of the substance is not uncommon. However, there are more and more reports indicating that multiple injections may lead to a long-term increase in intraocular pressure...
February 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28226387/-general-effects-on-glaucoma
#10
Carl Erb
No abstract text is available yet for this article.
February 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28224390/plga-nanoparticles-as-subconjunctival-injection-for-management-of-glaucoma
#11
Hamed A Salama, Mahmoud Ghorab, Azza A Mahmoud, Mayssa Abdel Hady
Nanoparticles fabricated from the biodegradable and biocompatible polymer, polylactic-co-glycolic acid (PLGA), could be a promising system for targeting ocular drug delivery. The objective of this work was to investigate the possibility of encapsulating brinzolamide in PLGA nanoparticles in order to be applied as a subconjunctival injection that could represent a starting point for developing new therapeutic strategies against increase in ocular pressure. The brinzolamide-loaded PLGA nanoparticles were fabricated using emulsion-diffusion-evaporation method with varying concentrations of Tween 80 or poloxamer 188 (Plx) in aqueous and organic phases...
February 21, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28223915/oral-delivery-of-a-synthetic-sterol-reduces-axonopathy-and-inflammation-in-a-rodent-model-of-glaucoma
#12
Wendi S Lambert, Brian J Carlson, Cathryn R Formichella, Rebecca M Sappington, Clarence Ahlem, David J Calkins
Glaucoma is a group of optic neuropathies associated with aging and sensitivity to intraocular pressure (IOP). The disease is the leading cause of irreversible blindness worldwide. Early progression in glaucoma involves dysfunction of retinal ganglion cell (RGC) axons, which comprise the optic nerve. Deficits in anterograde transport along RGC axons to central visual structures precede outright degeneration, and preventing these deficits is efficacious at abating subsequent progression. HE3286 is a synthetic sterol derivative that has shown therapeutic promise in models of inflammatory disease and neurodegenerative disease...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28223208/characterizing-the-poagome-a-bioinformatics-driven-approach-to-primary-open-angle-glaucoma
#13
REVIEW
Ian D Danford, Lana D Verkuil, Daniel J Choi, David W Collins, Harini V Gudiseva, Katherine E Uyhazi, Marisa K Lau, Levi N Kanu, Gregory R Grant, Venkata R M Chavali, Joan M O'Brien
Primary open-angle glaucoma (POAG) is a genetically, physiologically, and phenotypically complex neurodegenerative disorder. This study addressed the expanding collection of genes associated with POAG, referred to as the "POAGome." We used bioinformatics tools to perform an extensive, systematic literature search and compiled 522 genes with confirmed associations with POAG and its related phenotypes (normal tension glaucoma, ocular hypertension, juvenile open-angle glaucoma, and primary congenital glaucoma)...
February 18, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/28223180/biomechanical-aspects-of-axonal-damage-in-glaucoma-a-brief-review
#14
REVIEW
Cheri Stowell, Claude Burgoyne, Ernst R Tamm, C Ross Ethier
The biomechanical environment within the optic nerve head (ONH) is complex and is likely directly involved in the loss of retinal ganglion cells (RGCs) in glaucoma. Unfortunately, our understanding of this process is poor. Here we describe factors that influence ONH biomechanics, including ONH connective tissue microarchitecture and anatomy; intraocular pressure (IOP); and cerebrospinal fluid pressure (CSFp). We note that connective tissue factors can vary significantly from one individual to the next, as well as regionally within an eye, and that the understanding of ONH biomechanics is hindered by anatomical differences between small-animal models of glaucoma (rats and mice) and humans...
February 18, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28223179/biological-aspects-of-axonal-damage-in-glaucoma-a-brief-review
#15
REVIEW
Ernst R Tamm, C Ross Ethier, Claude Burgoyne, C Ross Ethier, Ernst R Tamm, Cheri Stowell, John E Dowling, Crawford Downs, Mark H Ellisman, Steven Fisher, Brad Fortune, Marcus Fruttiger, Tatjana Jakobs, Geoffrey Lewis, Claire H Mitchell, John Morrison, Sansar C Sharma, Ian Sigal, Michael Sofroniew, Lin Wang, Janey Wiggs, Samuel Wu, Richard H Masland
Intraocular pressure (IOP) is a critical risk factor in glaucoma, and the available evidence derived from experimental studies in primates and rodents strongly indicates that the site of IOP-induced axonal damage in glaucoma is at the optic nerve head (ONH). However, the mechanisms that cause IOP-induced damage at the ONH are far from understood. A possible sequence of events could originate with IOP-induced stress in the ONH connective tissue elements (peripapillary sclera, scleral canal and lamina cribrosa) that leads to an increase in biomechanical strain...
February 18, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28222316/discovery-and-characterization-of-novel-cyp1b1-inhibitors-based-on-heterocyclic-chalcones-overcoming-cisplatin-resistance-in-cyp1b1-overexpressing-lines
#16
Neill J Horley, Kenneth J M Beresford, Tarun Chawla, Glen J P McCann, Ketan C Ruparelia, Linda Gatchie, Vinay R Sonawane, Ibidapo S Williams, Hoon L Tan, Prashant Joshi, Sonali S Bharate, Vikas Kumar, Sandip B Bharate, Bhabatosh Chaudhuri
The structure of alpha-napthoflavone (ANF), a potent inhibitor of CYP1A1 and CYP1B1, mimics the structure of chalcones. Two potent CYP1B1 inhibitors 7k (DMU2105) and 6j (DMU2139) have been identified from two series of synthetic pyridylchalcones. They inhibit human CYP1B1 enzyme bound to yeast-derived microsomes (Sacchrosomes™) with IC50 values of 10 and 9 nM, respectively, and show a very high level of selectivity towards CYP1B1 with respect to the IC50 values obtained with CYP1A1, CYP1A2, CYP3A4, CYP2D6, CYP2C9 and CYP2C19 Sacchrosomes™...
February 9, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28221702/localized-and-controlled-delivery-of-nitric-oxide-to-the-conventional-outflow-pathway-via-enzyme-biocatalysis-toward-therapy-for-glaucoma
#17
Rona Chandrawati, Jason Y H Chang, Ester Reina-Torres, Coline Jumeaux, Joseph M Sherwood, W Daniel Stamer, Alexander N Zelikin, Darryl R Overby, Molly M Stevens
Nitric oxide (NO) is able to lower intraocular pressure (IOP); however, its therapeutic effects on outflow physiology are location- and dose-dependent. An NO delivery platform that directly targets the resistance-generating region of the conventional outflow pathway and locally liberates a controlled dose of NO is reported. An increase in outflow facility (decrease in IOP) is demonstrated in a mouse model.
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28221332/sustained-resolution-of-macular-retinoschisis-after-trabeculectomy-in-a-patient-with-progressive-glaucoma
#18
Rany Woo, Handan Akil, Nicole Koulisis, Lisa C Olmos de Koo, James C H Tan
PURPOSE: To evaluate the clinical characteristics of a patient with primary open-angle glaucoma in whom macular retinoschisis resolved completely after trabeculectomy consistently lowered intraocular pressure (IOP). METHODS: A single case report. RESULTS: We report a case of retinoschisis involving the macula in a patient with primary open-angle glaucoma in the absence of myopic maculopathy, optic nerve anomaly, or x-linked retinoschisis. The patient's glaucoma was associated with progressive visual field loss in the setting of IOP fluctuations related to posture...
February 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28221329/relationship-between-anterior-lamina-cribrosa-surface-tilt-and-glaucoma-development-in-myopic-eyes
#19
Eun Jung Lee, Jong Chul Han, Changwon Kee
PURPOSE: To evaluate the anterior lamina cribrosa (LC) surface tilt angle in myopic eyes and associate it with glaucoma development. MATERIALS AND METHODS: In this retrospective study, medical records of myopic patients referred for glaucoma examination from July 1, 2012 to March 30, 2016 were reviewed. Comprehensive ophthalmic examination including spectral-domain optical coherence tomography were performed. We measured the angle of anterior LC surface tilt against Bruch's membrane opening from optical coherence tomography images at the center of the clinical optic disc margin...
February 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28221328/retinotopic-fmri-reveals-visual-dysfunction-and-functional-reorganization-in-the-visual-cortex-of-mild-to-moderate-glaucoma-patients
#20
Wei Zhou, Eric R Muir, Kundandeep S Nagi, Steven Chalfin, Pavel Rodriguez, Timothy Q Duong
PURPOSE: To investigate retinotopic functional representation in the visual cortex of mild to moderate primary open-angle glaucoma (POAG) participants and age-matched normal volunteers using high-resolution retinotopic blood oxygenation level dependent (BOLD) functional magnetic resonance imaging (fMRI). METHODS: fMRI was performed on 9 POAG participants (61±11 y old) and 9 age-matched controls (58±5 y old) were studied. A wide-view visual presentation (±55 degrees) was used to evaluate central and peripheral vision...
February 17, 2017: Journal of Glaucoma
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