Three critical improvements for present day and future retinal vision implants are proposed and discussed: (1) A time profile for the stimulation current that leads predominantly to transverse stimulation of nerve cells; (2) auxiliary electric currents for electric field shaping with a time profile chosen such that these currents have small probability to cause stimulation; and (3) a local area scanning procedure that results in high pixel density for image/percept formation (except for losses at the boundary of an electrode array).
@article{arxiv.1210.5348,
title = {Operational Design Considerations for Retinal Prostheses},
author = {Erich W. Schmid and Wolfgang Fink},
journal= {arXiv preprint arXiv:1210.5348},
year = {2012}
}