International Ophthalmology

, Volume 16, Issue 4, pp 211–214

The pattern ERG in glaucoma: effect of pattern reversal time

Authors

  • Peter Mierdel
    • Eye ClinicMedical Academy ‘Carl Gustav Camru’
  • Hans -Joachim Zenker
    • Eye ClinicMedical Academy ‘Carl Gustav Camru’
  • Ernst Marré
    • Eye ClinicMedical Academy ‘Carl Gustav Camru’
Section 1: Visual Function

DOI: 10.1007/BF00917963

Cite this article as:
Mierdel, P., Zenker, H.-. & Marré, E. Int Ophthalmol (1992) 16: 211. doi:10.1007/BF00917963

Abstract

Pattern reversals with a ramp-like temporal course evoke transient pattern electroretinograms (PERG) that are delayed and attenuated in comparison with responses evoked by a step-like course (abrupt pattern reversals). This delay depends on the reversal time and probably represents a measure for temporal characteristics of the activated retinal structures. A pattern reversal stimulator with adjustable reversa) periods (matrix of 8X14 rectangular red light emitting diodes, element size 2° X 1°, stimulus area 16° X 14°) was used to record transient PERGs from 20 glaucomatous eyes with early or moderate visual field damages (measured with computer perimetry). The q-wave (P1) amplitude difference between the glaucoma group and normal subjects with step-like reversal stimulation was not significantP=0.23). On the other hand, a highly significant separation (P< 0.0001) between both groups was possible using the P1 latency at ramp-like stimulation or the response latency shift between step and ramp-like stimulation (Pattern reversal time, 30 ms).

Key words

glaucomapattern-reversal electroretinogram latencyvisual field indices

Copyright information

© Kluwer Academic Publishers 1992