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  5. A head mounted device stimulator for optogenetic retinal prosthesis
 
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A head mounted device stimulator for optogenetic retinal prosthesis
File(s)
A head mounted device stimulator for optogenetic retinal prosthesis.pdf (4.29 MB)
Accepted version
Author(s)
Soltan, Ahmed
Barrett, John Martin
Maaskant, Pleun
Armstrong, Niall
Al-Atabany, Walid
more
Type
Journal Article
Abstract
Objective. Our main objective is to demonstrate that compact high radiance gallium nitride displays can be used with conventional virtual reality optics to stimulate an optogenetic retina. Hence, we aim to introduce a non-invasive approach to restore vision for people with conditions such as retinitis pigmentosa where there is a remaining viable communication link between the retina and the visual cortex. Approach. We design and implement the headset using a high-density µLED matrix, Raspberry Pi, microcontroller from NXP and virtual reality lens. Then, a test platform is developed to evaluate the performance of the headset and the optical system. Furthermore, image simplification algorithms are used to simplify the scene to be sent to the retina. Moreover, in vivo evaluation of the genetically modified retina response at different light intensity is discussed to prove the reliability of the proposed system. Main results. We demonstrate that in keeping with regulatory guidance, the headset displays need to limit their luminance to 90 kcd m−2. We demonstrate an optical system with 5.75% efficiency which allows for 0.16 mW mm−2 irradiance on the retina within the regulatory guidance, but which is capable of an average peak irradiance of 1.35 mW mm−2. As this is lower than the commonly accepted threshold for channelrhodopsin-2, we demonstrate efficacy through an optical model of an eye onto a biological retina. Significance. We demonstrate a fully functional 8100-pixel headset system including software/hardware which can operate on a standard consumer battery for periods exceeding a 24 h recharge cycle. The headset is capable of delivering enough light to stimulate the genetically modified retina cells and also keeping the amount of light below the regulation threshold for safety.
Date Issued
2018-10-09
Date Acceptance
2018-08-29
Citation
Journal of Neural Engineering, 2018, 15 (6)
URI
http://hdl.handle.net/10044/1/83119
DOI
https://www.dx.doi.org/10.1088/1741-2552/aadd55
ISSN
1741-2552
Publisher
IOP Publishing
Journal / Book Title
Journal of Neural Engineering
Volume
15
Issue
6
Copyright Statement
© 2018 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
License URL
https://creativecommons.org/licenses/by/3.0/
Sponsor
Engineering & Physical Science Research Council (E
Commission of the European Communities
Engineering & Physical Science Research Council (E
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000447050900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
GR/S85764/01
249867
EP/K503733/1
Subjects
Science & Technology
Technology
Life Sciences & Biomedicine
Engineering, Biomedical
Neurosciences
Engineering
Neurosciences & Neurology
retinal prosthesis
visual prosthesis
optogenetics
electronics
regulatory
channelrhodopsin
retinitis pigmentosa
PIXELIZED VISION SYSTEM
RESTORES VISUAL RESPONSES
LIGHT-EMITTING-DIODES
RETINITIS-PIGMENTOSA
NEURAL STIMULATION
CHANNELRHODOPSIN-2
RECOGNITION
PERFORMANCE
IMPAIRMENT
BLINDNESS
Publication Status
Published
Article Number
ARTN 065002
Date Publish Online
2018-10-09
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