Table 1.

Overview on known sizes (width/height/thickness) of electrode arrays used in retina implants with direct retinal contact and their respective number of electrodes

Implant	Concept	# of electrodes	Dimensions (w/h/t in mm)
Retinal implant AG	Subretinal	1500	3/3/0.07*)
Argus II second sight	Epiretinal	60	5/5/0.5**)
EPIRET III	Epiretinal	25	2/3/0.02 [8]

*)E. Zrenner, et al. Visual Sensations Mediated By Subretinal Microelectrode Arrays Implanted into Blind Retinitis Pigmentosa Patients. Proc. 13th Annu. Conf. of the IFESS, Freiburg, 2008.

**)V. Kandagor, et al. In situ Characterization of Stimulating Microelectrode Arrays: Study of an Idealized Structure Based on Argus II Retinal implants. Implantable Neural Prostheses, Springer New York; 2010. pp. 139-56.