Electrofisiología de la visión: generalización de estudios normativos en individuos sanos

Abstract

Objective: to obtain normative data of standard and pattern electroretinography as well as pattern and diffuse light visual evoked potentials from a group of healthy individuals. Methods: a prospective and descriptive study conducted in healthy subjects who were seen at the neurophthalmology service in "Ramón Pando Ferrer" Cuban Institute of Ophthalmology in a six-month period. Sixty eyes of adults aged 20-40 years of both sexes with normal ophthalmologic physical examination results were included. Results: mean values of amplitude and latency at the wave peak of P50 for the pattern electroretinogram were 1,75 microvolts and 53,7 ms. The standard electroretinogram showed b-wave amplitude values of 300, 550 and 290 microvolts for scotopic, mesopic and photopic responses, respectively. The latency of the P100 wave peak in pattern visual evoked potentials at 60 and 20 minutes of arc were 107 and 110 ms and at the diffuse light response, P-2 value was 110 ms with interocular difference lower than 5 ms in both studies. Conclusions: the suggested electrophysiological studies show normal useful values in the evaluation of pathological findings indicative of visual functional impairment at different levels and they may serve as a valid tool of reference for the rest of visual electrophysiology laboratories located in the ophthalmological centers nationwide.

Keywords

• electrodiagnóstico visual
• valores normativos