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Rozprawy doktorskie na temat „Vision prosthesis”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Sprawdź 22 najlepszych rozpraw doktorskich naukowych na temat „Vision prosthesis”.

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Wong, Yan Tat Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Effects of neurostimulation via a suprachoroidal vision prosthesis." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2009. http://handle.unsw.edu.au/1959.4/43654.

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Microelectronic vision prostheses aim to restore visual percepts through electrical stimulation of the surviving visual pathways in the blind. Electrical stimulation has been shown to produce spots of light in the visual field. A neurostimulator that forms the basis of a vision prosthesis was designed using a high voltage CMOS process to allow it to be able to stimulate when faced with high electrode-tissue impedances. It was implemented with novel features that allow it to be scalable, and to focus charge injection, and can stimulate multiple sites simultaneously using a current source and si
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Dommel, Norbert Brian Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "A vision prosthesis neurostimulator: progress towards the realisation of a neural prosthesis for the blind." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2008. http://handle.unsw.edu.au/1959.4/41249.

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Restoring vision to the blind has been an objective of several research teams for a number of years. It is known that spots of light -- phosphenes -- can be elicited by way of electrical stimulation of surviving retinal neurons. Beyond this, however, our understanding of prosthetic vision remains rudimentary. To advance the realisation of a clinically viable prosthesis for the blind, a versatile integrated circuit neurostimulator was designed, manufactured, and verified. The neurostimulator provides electrical stimuli to surviving neurons in the visual pathway, affording blind patients some f
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Siu, Timothy Lok Tin Medical Sciences Faculty of Medicine UNSW. "Artificial vision: feasibility of an episcleral retinal prosthesis & implications of neuroplasticity." Awarded By:University of New South Wales. Medical Sciences, 2009. http://handle.unsw.edu.au/1959.4/42879.

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Background. A visual prosthesis is a conceptual device designed to activate residual functional neurons in the visual pathway of blind individuals to produce artificial vision. Such device, when applied to stimulate the vitreous surface of the retina, has proven feasible in producing patterned light perception in blind individuals suffering from dystrophic diseases of the retina, such as aged-related macular degeneration (AMD). However the practicality of such approach has been challenged by the difficulty of surgical access and the risks of damaging the neuroretina. Positioning a visual impla
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Luján, Villarreal Diego [Verfasser], and Wolfgang [Akademischer Betreuer] Krautschneider. "Toward pixel-wise vision in epiretinal visual prosthesis / Diego Luján Villarreal ; Betreuer: Wolfgang Krautschneider." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2017. http://d-nb.info/1145033768/34.

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Tatur, Guillaume. "Conception d'un système de vision par phosphènes." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20006.

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Ces travaux s'inscrivent dans le cadre plus général de la réalisation d'une prothèse visuelle, destinée aux personnes atteintes de cécité tardive due à une maladie dégénérative des cellules photo réceptrices de la rétine. Par la stimulation adéquate de certaines parties des voies optiques encore fonctionnelles, il est possible de transmettre à nouveau des perceptions visuelles, appelées phosphènes, dans le champ visuel du patient. Les études actuelles portant sur le contenu informationnel de cette vision prothétique proposent simplement de réduire la résolution de l'image d'une caméra embarqué
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Hallum, Luke Edward Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Prosthetic vision : Visual modelling, information theory and neural correlates." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2008. http://handle.unsw.edu.au/1959.4/41450.

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Electrical stimulation of the retina affected by photoreceptor loss (e.g., cases of retinitis pigmentosa) elicits the perception of luminous spots (so-called phosphenes) in the visual field. This phenomenon, attributed to the relatively high survival rates of neurons comprising the retina's inner layer, serves as the cornerstone of efforts to provide a microelectronic retinal prosthesis -- a device analogous to the cochlear implant. This thesis concerns phosphenes -- their elicitation and modulation, and, in turn, image analysis for use in a prosthesis. This thesis begins with a comparative r
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Dowling, Jason Anthony. "Mobility enhancement using simulated artificial human vision." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16380/1/Jason_Dowling_Thesis.pdf.

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The electrical stimulation of appropriate components of the human visual system can result in the perception of blobs of light (or phosphenes) in totally blind patients. By stimulating an array of closely aligned electrodes it is possible for a patient to perceive very low-resolution images from spatially aligned phosphenes. Using this approach, a number of international research groups are working toward developing multiple electrode systems (called Artificial Human Vision (AHV) systems or visual prostheses) to provide a phosphene-based substitute for normal human vision. Despite the great pr
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Dowling, Jason Anthony. "Mobility enhancement using simulated artificial human vision." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16380/.

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The electrical stimulation of appropriate components of the human visual system can result in the perception of blobs of light (or phosphenes) in totally blind patients. By stimulating an array of closely aligned electrodes it is possible for a patient to perceive very low-resolution images from spatially aligned phosphenes. Using this approach, a number of international research groups are working toward developing multiple electrode systems (called Artificial Human Vision (AHV) systems or visual prostheses) to provide a phosphene-based substitute for normal human vision. Despite the great pr
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Maghribi, M. "Microfabrication of an Implantable silicone Microelectrode array for an epiretinal prosthesis." Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/15005780-5uYpbJ/native/.

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Thesis (Ph.D.); Submitted to the Univ. of California, Davis, CA (US); 10 Jun 2003.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "UCRL-LR-153347" Maghribi, M. 06/10/2003. Report is also available in paper and microfiche from NTIS.
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Mailhot, Nathaniel. "Pupil Tracking and Control of a Laser Based Power System for a Vision Restoring Retinal Implant." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38709.

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For elderly Canadians, the prevalence of vision impairment caused by degenerative retinal pathologies, such as age-related macular degeneration and retinitis pigmentosa, is at an occurrence rate of 14 percent, and on the rise. It has been shown that visual function can be restored by electrically stimulating intact retinal tissue with an array of micro-electrodes with suitable signals. Commercial retinal implants carrying such a micro-electrode array achieve this, but to date must receive power and data over copper wire cable passing through a permanent surgical incision in the eye wall
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Chen, Spencer Chin-Yu Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "The perception and comprehension of prosthetic vison: patient rehabilitation and image processing considerations from simulated prosthetic vision psychophysics." Publisher:University of New South Wales. Graduate School of Biomedical Engineering, 2009. http://handle.unsw.edu.au/1959.4/44414.

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A successful restoration of vision should allow the blind to look, to see and to understand. The engineering of a microelectronic vision prosthesis has come a long way over the last forty years, but the understanding of how the restored form of vision would be interpreted and functionally applied to everyday living has made little progress until recent times. Prosthetic vision is not what most people think it would be; it is a visual scene composed of relatively large, isolated, spots of light so-called "phosphenes", very much like a magnified pictorial print. This thesis dissertation seeks to
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Boyle, Justin Robert. "Improving Perception From Electronic Visual Prostheses." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16106/1/Justin_Boyle_Thesis.pdf.

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This thesis explores methods for enhancing digital image-like sensations which might be similar to those experienced by blind users of electronic visual prostheses. Visual prostheses, otherwise referred to as artificial vision systems or bionic eyes, may operate at ultra low image quality and information levels as opposed to more common electronic displays such as televisions, for which our expectations of image quality are much higher. The scope of the research is limited to enhancement by digital image processing: that is, by manipulating the content of images presented to the user. The work
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Boyle, Justin Robert. "Improving Perception From Electronic Visual Prostheses." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16106/.

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This thesis explores methods for enhancing digital image-like sensations which might be similar to those experienced by blind users of electronic visual prostheses. Visual prostheses, otherwise referred to as artificial vision systems or bionic eyes, may operate at ultra low image quality and information levels as opposed to more common electronic displays such as televisions, for which our expectations of image quality are much higher. The scope of the research is limited to enhancement by digital image processing: that is, by manipulating the content of images presented to the user. The work
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Sabatier, Quentin. "Development and validation of stimulation strategies for the optogenetics." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS083.

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Un million et demi de personnes souffrent de la Rétinopathie Pigmentaire, une famille de maladies héréditaires entraînant une dégénérescence de la rétine. La maladie commence par la perte de la vision nocturne et du champ visuel périphérique et mène à une cécité totale. En raison de l'hétérogénéité des mutations génétiques responsables de la maladie, des solutions visant à compenser les symptômes de la maladie émergent. Ces prothèses rétiniennes comportent trois éléments : (i) une caméra filmant la scène devant le patient, habituellement montée sur une paire de lunettes et (ii) un dispositif d
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Vergnieux, Victor. "Naviguer en vision prothétique simulée : apport de la vision par ordinateur pour augmenter les rendus prothétiques de basse résolution." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30323/document.

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La cécité touche 39 millions de personnes dans le monde et génère de nombreuses difficultés dans la vie quotidienne. Plus précisément, les capacités de navigation (incluant orientation et mobilité) sont fortement diminuées, ce qui amène les personnes non-voyantes à limiter, voire à cesser leurs déplacements. Pour restaurer des sensations "visuelles", et par-delà, une certaine autonomie, il est possible de stimuler directement le système visuel résiduel d'une personne non-voyante à l'aide d'un implant administrant des micro-stimulations électriques. Le dispositif complet se compose d'une micro-
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Savallampi, Mattias. "The Role of Vision in Attributing the Sense of Part- and Full-Body Ownership During Anomalous Conditions." Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11363.

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Our bodies are arguably one of the most intimate things we will ever know. But the comfort of our own physical boundaries can be altered in various ways. In this analysis, we will look at how vision contributes to the sense of owning a body by analysing six abnormal conditions: the rubber hand illusion, phantom limbs, somatoparaphrenia, the body-swap illusion, out-of-body experiences, and heautoscopy. Examinations of these experimental or pathological conditions has granted a greater understanding of body-ownership. It was discovered that vision plays different modulatory roles, being more int
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Poujade, Mylène. "Apport des dispositifs de restauration de la vision et de la résolution temporelle." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS319.

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La rétinite pigmentaire est une maladie neurodégénérative héréditaire de la rétine entraînant la cécité. Des technologies restaurant la vision ont vu le jour comme les neuroprothèses visuelles et la thérapie optogénétique. Leur limitation est la résolution spatiale. La neuroprothèse visuelle IRIS I de Pixium Vision et la thérapie optogénétique de Gensigth Biologics permettent une stimulation à haute fréquence temporelle. Or, augmenter la résolution temporelle mène à une stimulation plus naturelle pouvant compenser la résolution spatiale limitée. Notre étude évalue l’apport de la vision restaur
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Chen, Yi-Chung, and 陳奕中. "Vision Assist System for visually impaired people treated by retinal prosthesis." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3zqrkm.

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碩士<br>國立交通大學<br>電子工程學系 電子研究所<br>102<br>The vision quality of the visually impaired people treated by retinal prosthesis is largely affected by the vision resolution. Due to some related technical bottlenecks, how to make effective use of existing low-resolution screen becomes an important issue. This paper presents an eye-controlled visual aid system to achieve an efficient use of low-resolution vision by zooming in the user's interested objects (when staring, zoom-in; when closing eye, zoom-out). In order to better simulate the actual low-resolution vision of the patients, we have also design
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Timmis, Matthew A., Louise Johnson, David B. Elliott, and John G. Buckley. "Use of single-vision distance spectacles improves landing control during step descent in well-adapted multifocal lens-wearers." 2010. http://hdl.handle.net/10454/6214.

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No<br>PURPOSE: Epidemiologic research has shown that multifocal spectacle wearers (bifocal and progressive addition lenses [PALs]) are more than twice as likely to fall than are nonmultifocal spectacle wearers, with this risk further increasing when negotiating stairs. The present study investigated whether step and stair descent safety is improved by using single-vision distance lenses. METHODS: From a stationary standing position on top of a block, 20 long-term multifocal wearers stepped down (from different block heights) onto a lower level wearing bifocal, progressive addition, or single-v
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Horne, Lachlan Stuart. "Semantic Labelling for Prosthetic Vision." Phd thesis, 2019. http://hdl.handle.net/1885/173943.

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Low or impaired vision is a common cause of disability, with prevalence rates estimated to be between 2.7% and 5.8%. Those with low vision report reduced independence and social function, resulting in lower overall quality of life. While many causes of vision loss can be treated, there are still no therapies which can fully restore vision lost to retinitis pigmentosa or macular degeneration. Prosthetic vision systems aim to improve quality of life by restoring recipients' ability to carry out everyday visual tasks. When parts of the visual system are affected by disease or injury, visual prost
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Feng, David. "RGB-D Scene Representations for Prosthetic Vision." Phd thesis, 2017. http://hdl.handle.net/1885/167000.

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This thesis presents a new approach to scene representation for prosthetic vision. Structurally salient information from the scene is conveyed through the prosthetic vision display. Given the low resolution and dynamic range of the display, this enables robust identification and reliable interpretation of key structural features that are missed when using standard appearance-based scene representations. Specifically, two different types of salient structure are investigated: salient edge structure, for depiction of scene shape to the user; and salient object structure, for emulation of biologi
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Ferreira, Nuno Miguel Farias Dias. "Reabilitação de selas livres com prótese removível : caracterização e resolução de complicações." Master's thesis, 2015. http://hdl.handle.net/10400.14/18788.

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Introdução: a reabilitação oral com prótese parcial removível assume um papel muito relevante no restabelecimento das principais funções do sistema estomatognático, em função da prevalência das desdentações parciais numa população cada vez mais envelhecida. Nesta perspetiva, torna-se importante conhecer e caracterizar as principais complicações associadas ao uso de próteses parciais removíveis, por forma a contribuir para a otimização da sua resolução. Objetivos: identificar e caracterizar as complicações existentes em próteses parciais removíveis em desdentações tipo classe I e II de Kennedy
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