Academic
Publications
Resolution of the Epiretinal Prosthesis is not Limited by Electrode Size

Resolution of the Epiretinal Prosthesis is not Limited by Electrode Size,10.1109/TNSRE.2011.2140132,IEEE Transactions on Neural Systems and Rehabilita

Resolution of the Epiretinal Prosthesis is not Limited by Electrode Size  
BibTex | RIS | RefWorks Download
Epiretinal prostheses for the blind bypass diseased photosensitive cells in the retina, directly stimulating retinal neu- rons electrically and evoking signals that are relayed to the brain. Current clinical implants have few electrodes and provide limited visual acuity. Acuity may be improved by identifying electrode array design features and operational details that enhance or interfere with visual percept formation. We labeled all retinal ganglion cells in whole mount retina with a calcium reporter and then measured the number and pattern of cells responding, over a range of electrode diameters and stimulus durations. Span of the response scaled with electrode diameter for electrodes 60 m and larger. Short stimulation pulse widths selectively activated cells nearest the electrode. Our measurements in the salamander retina suggest that the spatial resolution is 150 m, which on a human retina is equivalent to 0.55 of human visual field and corresponding Snellen acuity of 20/660. Reading large print could be possible with such a prosthesis. Index Terms—Artificial vision, calcium imaging, electrical stim- ulation, neural stimulation, retina, visual acuity.
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.