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Related Experiment Videos

Check-size specific changes of pattern electroretinogram in patients with early open-angle glaucoma.

M Bach1, P Hiss, J Röver

  • 1Universitäts-Augenklinik, Freiburg, BRD.

Documenta Ophthalmologica. Advances in Ophthalmology
|July 1, 1988
PubMed
Summary

Pattern electroretinogram (PERG) shows reduced amplitude in glaucoma patients for small visual stimuli. This finding suggests PERG can detect early ganglion cell dysfunction in open-angle glaucoma.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Open-angle glaucoma is a leading cause of irreversible blindness.
  • Early detection of glaucomatous visual field defects is crucial for timely intervention.
  • The pattern electroretinogram (PERG) assesses the function of the inner retina, particularly ganglion cells.

Purpose of the Study:

  • To investigate the sensitivity of the pattern electroretinogram (PERG) in detecting early-stage open-angle glaucoma.
  • To explore the differential effects of check size on PERG amplitude in glaucoma patients compared to normal subjects.

Main Methods:

  • Recorded pattern electroretinogram (PERG) in patients with early open-angle glaucoma and age-matched controls.
  • Utilized counterphasing checkerboard patterns of varying check sizes (0.8 to 15 degrees) at 7.8 Hz.

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  • Assessed visual acuity, ensuring all participants had acuity above 0.8.

    • Main Results:

    • Glaucoma patients exhibited significantly reduced PERG amplitudes for small check sizes (p = 0.003).
    • PERG amplitudes were nearly normal for large check sizes in glaucoma patients.
    • The ratio of amplitudes between small and large checks was significantly lower in glaucoma patients (p < 0.0002).

    Conclusions:

    • The pattern electroretinogram (PERG) is a sensitive indicator of early ganglion cell dysfunction in open-angle glaucoma.
    • Differential responses to small and large check sizes suggest involvement of magnocellular and parvocellular pathways.
    • Using the ratio of small-to-large check size amplitudes enhances PERG's diagnostic sensitivity and reduces variability.