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Related Experiment Videos

Macular sparing as a perimetric artifact

P Bischoff1, J Lang, A Huber

  • 1Department of Ophthalmology, Kantonsspital, St. Gallen, Switzerland.

American Journal of Ophthalmology
|January 1, 1995
PubMed
Summary

Macular sparing in hemianopic patients may be a visual field test artifact, not an anatomical feature. Unstable fixation and searching eye movements toward the seeing side likely cause this phenomenon.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Macular sparing, a common finding in hemianopic patients, has traditionally been attributed to anatomical reasons.
  • The exact mechanism underlying macular sparing remains a subject of investigation.

Purpose of the Study:

  • To test the hypothesis that macular sparing is an artifact caused by unstable fixation and nystagmiform searching movements.
  • To investigate the relationship between fixation stability and the extent of macular sparing.

Main Methods:

  • Utilized microperimetry with a scanning laser ophthalmoscope for visual field testing in 15 hemianopic patients.
  • Direct visual control of the retina was employed to accurately record fixation shifts during testing.

Main Results:

  • Twelve patients exhibited 1-5 degrees of macular sparing, characterized by regular fixation shifts (1-10 degrees) towards the seeing hemiretina.
  • Three patients with greater macular sparing displayed extensive fixation shifts, dual fixation, and limited quadrantanopsia.

Conclusions:

  • Macular sparing may represent a perimetric artifact rather than an anatomical representation.
  • Further studies are needed to confirm these findings in a larger patient cohort.

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