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There was no significant relationship between electrode diameter and charge threshold for responses evoked by epiretinal stimulation in retinal ganglion and bipolar cells. Diamonds: Ganglion cell spikes. Squares: Ganglion cell–sustained currents. Triangles: Bipolar cell currents. One data point for a ganglion cell sustained currents, and two data points for bipolar cells sustained currents greater than 2 μC and are not presented on this graph.
