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. 2017 Feb 17;7:42682. doi: 10.1038/srep42682

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Panel A illustrates the 24-channel retinal electrode array and the return electrode used during in vivo electrophysiology. Each electrode within the array has a diameter of 380 μm (area 0.113 mm²) and centre-centre spacing of 730 μm. The return electrode was approximately 3.5 mm in diameter. Panel B illustrates connections between the neural stimulator and the electrode array. Seven electrodes arranged hexagonally were connected to the source (SR-i) of seven independent current sources. The monopolar return electrode was connected to the sink of all channels (SK-i). Panel C is an optical coherence tomography image obtained after implantation. The voxels containing information on the electrode array were projected into a 2-dimensional image. Panel D shows an infrared image of the fundus of the same implanted eye.