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Visual function in hypermetropia. An electroretinographic and psychophysical study

R Kennet1, E Meyer, I Perlman

  • 1Department of Ophthalmology, Haemek Medical Center, Afula, Israel.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1993
PubMed
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Severe hypermetropia patients with subnormal electroretinograms showed no functional vision decline over 8 years. Abnormal electroretinogram responses in hypermetropia likely stem from extraretinal tissue changes, not retinal dysfunction.

Area of Science:

  • Ophthalmology
  • Retinal Physiology
  • Visual Electrophysiology

Background:

  • Severe hypermetropia can be associated with altered electroretinogram (ERG) findings.
  • Previous studies classified hypermetropic patients into subnormal, normal, and supernormal ERG categories.

Purpose of the Study:

  • To assess the long-term stability of electroretinographic findings in hypermetropia.
  • To correlate electroretinographic results with psychophysically determined visual function.
  • To identify changes in refraction and ERG responses over an 8-year period.

Main Methods:

  • Longitudinal study involving electroretinography and psychophysical testing.
  • Patients with severe hypermetropia were re-examined after 8 years.
  • ERG responses (amplitudes, b-wave to a-wave ratios) and visual thresholds were analyzed.

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Main Results:

  • No significant changes in ERG amplitudes or b-wave to a-wave ratios were observed over 8 years.
  • Subnormal ERG findings in hypermetropia appear to represent a stationary defect.
  • Psychophysical visual function remained within normal limits for all patients, irrespective of ERG classification.

Conclusions:

  • The electroretinogram classification of hypermetropic patients remained stable over the 8-year follow-up.
  • Abnormal ERG responses in hypermetropia may be attributed to alterations in extraretinal tissue electrical resistance rather than intrinsic retinal dysfunction.