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Figure 3 | Journal of NeuroEngineering and Rehabilitation

Figure 3

From: Simulation of epiretinal prostheses - Evaluation of geometrical factors affecting stimulation thresholds

Figure 3

Threshold current versus electrode-retina distance. Evolution of computed threshold current with variation in electrode-retina distance for two electrode sizes (260 μm and 520 μm). We observe that there is a factor two difference of threshold between the two sizes when the electrode is in contact with the retina. Approximately, an order of magnitude increase in threshold current is observed when the electrode-retina distance reaches half of the electrode diameter. When electrode-retina distance exceeds the electrode diameter, the threshold current becomes proportional to the square of the distance. The corresponding charge injection limit (for 0.975 ms pulses) is displayed for both electrode sizes.

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