Retinal prosthesis to aid the visually impaired

Liu, W.; McGucken, E.; Vichienchom, Kasin; Clements, S. Mark; DeMarco, S.C.; Humayun, Mark S.; Juan, Eugene de; Weiland, J.; Greenberg, R.

doi:10.1109/icsmc.1999.812429

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…Research efforts in visual prostheses can be split into two broad approaches: those in which healthy retinal neurons are stimulated (1,2), and those in which visual cortical neurons are stimulated (3)(4)(5). Retinal approaches have enjoyed some success, but have been hampered in part because of retinal fragility, which complicates implantation, and retinal architecture, which complicates electrical stimulation.…”

mentioning

confidence: 99%

Demonstration of artificial visual percepts generated through thalamic microstimulation

Pezaris

Reid²

2007

Proc. Natl. Acad. Sci. U.S.A.

164

133

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Electrical stimulation of the visual system might serve as the foundation for a prosthetic device for the blind. We examined whether microstimulation of the dorsal lateral geniculate nucleus of the thalamus can generate localized visual percepts in alert monkeys. To assess electrically generated percepts, an eyemovement task was used with targets presented on a computer screen (optically) or through microstimulation of the lateral geniculate nucleus (electrically). Saccades (fast, direct eye movements) made to electrical targets were comparable to saccades made to optical targets. Gaze locations for electrical targets were well predicted by measured visual response maps of cells at the electrode tips. With two electrodes, two distinct targets could be independently created. A sequential saccade task verified that electrical targets were processed not in motor coordinates, but in visual spatial coordinates. Microstimulation produced predictable visual percepts, showing that this technique may be useful for a visual prosthesis.primate ͉ prosthesis ͉ tetrode

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mentioning

confidence: 99%

Demonstration of artificial visual percepts generated through thalamic microstimulation

Pezaris

Reid²

2007

Proc. Natl. Acad. Sci. U.S.A.

164

133

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“…However, many research groups have reported that patients with AMD and RD still have surviving inner nuclear and ganglion cell layers of the macular [1,2]. Therefore, the feasibility of electrical stimulation toward surviving retinal neurons is investigated by clinical studies [3,4], and retinal prostheses using electrical stimulation as illustrated in Figure 1 have been under investigation by many research groups.…”

Section: Introductionmentioning

confidence: 98%

Mechanical and electrical evaluation for the long-term stability of implanted 3D retinal microelectrode

Hong

Lee

Yoo

et al. 2011

2011 16th International Solid-State Sensors, Actuators and Microsystems Conference

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In this paper, the mechanical and electrical characteristics of 3D microelectrode are presented to provide the long-term stability of the implanted microelectrode. As the dimensions of the microelectrode become smaller, the microelectrode can be easily damaged by mechanical pressure and overinjected electric charge. In order to avoid these destructions, allowable mechanical and electrical stress should be determined. Experiments for durability evaluation are set up and performed to measure the mechanical force and safe charge injection limit. The result of the experiments shows that the allowable mechanical force in vertical and horizontal direction is 0.8165 N and 0.2068 N, respectively. In the charge injection test, it is observed that the density of injected charge is a prior factor in microelectrode dissolution rather than the total amount of injected charge.

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“…The external camera is attached to spectacles or goggles in order to have the same projection as the eyeballs. This camera exchanges data wirelessly with the array of electrodes which is attached to the retina of the eye, inside the eyeball [8]. The specific parts of the retina called bipolar and ganglion cells are then stimulated by the electrodes, based on what the camera has captured in simplified way.…”

Section: Introductionmentioning

confidence: 99%

3-layer implantable microstrip antenna optimised for retinal prosthesis system in MICS band

Permana

Fang

Cosic

2011

International Symposium on Bioelectronics and Bioinformations 2011

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Retinal Prosthesis has developed to a more advanced stage with the support of advancing technologies. However, there have not been enough details about the wireless mechanism within the system even though it is accountable for the information transmission from the camera to the electrodes and also the complexity of the process itself due to the challenging environments. This paper will discuss about a design of high performance antenna that suits the challenging condition of the implantable devices. Its performance will then be compared with similar antennas that have been proposed or built previously.

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Retinal prosthesis to aid the visually impaired

Cited by 11 publications

References 11 publications

Demonstration of artificial visual percepts generated through thalamic microstimulation

Demonstration of artificial visual percepts generated through thalamic microstimulation

Mechanical and electrical evaluation for the long-term stability of implanted 3D retinal microelectrode

3-layer implantable microstrip antenna optimised for retinal prosthesis system in MICS band

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