| abstract |
The stimulating electrode array placed in close proximity to the retina is a critical component of a retinal prosthesis. It is through this interface that a retinal prosthesis electrically stimulates neurons to produce a perception of light. Fabric resistance and complex electrode impedance constitute the impedance load seen by the current driver. The results show that the resistance of the retinal tissue is significantly greater than that of the vitreous in the oel. Circuit models of the electrode-retina interface are used to parameterize the different contributors to the overall impedance. |