Fig. 11

Charge density distribution at the NFL/VB interface under electrical stimulation of TC. a Correlation between disk electrode size and the distribution of charge density. The diameter of disk electrode varied from 50 μm to 200 μm, and all ERD was fixed at 20 μm. (TC: Φ = 50 μm: 2.15 μA; Φ = 100 μm: 2.61 μA; Φ = 150 μm: 3.37 μA; Φ = 200 μm: 4.05 μA) (b) Correlation between ERD and the distribution of charge density. The ERD varied from 20 μm to 80 μm, and the diameter of disk electrode was fixed at 50 μm. (TC: ERD = 20 μm: 2.15 μA; ERD = 40 μm: 3.66 μA; ERD = 60 μm: 5.07 μA; ERD = 80 μm: 6.18 μA) (c) Correlation between the electrode geometrical shape and the distribution of charge density. All electrodes were with the same 50 μm diameter disk projection to the retinal plane and the same ERD of 20 μm. (TC: disk: 2.15 μA; concave hemispherical: 4.27 μA; concave conical: 4.26 μA; convex hemispherical: 6.78 μA; convex conical: 6.74 μA)