International Ophthalmology

, Volume 16, Issue 4–5, pp 211–214 | Cite as

The pattern ERG in glaucoma: effect of pattern reversal time

  • Peter Mierdel
  • Hans -Joachim Zenker
  • Ernst Marré
Section 1: Visual Function

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

glaucoma pattern-reversal electroretinogram latency visual field indices 

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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Peter Mierdel
    • 1
  • Hans -Joachim Zenker
    • 1
  • Ernst Marré
    • 1
  1. 1.Eye ClinicMedical Academy ‘Carl Gustav Camru’DresdenGermany

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