Electrically elicited visual evoked potentials in Argus II retinal implant wearers.

ABSTRACT:

Purpose

We characterized electrically elicited visual evoked potentials (eVEPs) in Argus II retinal implant wearers.

Methods

eVEPs were recorded in four subjects, and analyzed by determining amplitude and latency of the first two positive peaks (P1 and P2). Subjects provided subjective feedback by rating the brightness and size of the phosphenes. We established eVEP input-output relationships, eVEP variability between and within subjects, the effect of stimulating different areas of the retina, and the maximal pulse rate to record eVEPs reliably.

Results

eVEP waveforms had low signal-to-noise ratios, requiring long recording times and substantial signal processing. Waveforms varied between subjects, but showed good reproducibility and consistent parameter dependence w

SUBMITTER: Stronks HC 

PROVIDER: S-EPMC3676187 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature