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Threshold Amsler grid testing in maculopathies.

M Wall1, D R May

  • 1Department of Ophthalmology, Tulane University School of Medicine, New Orleans, LA.

Ophthalmology
|September 1, 1987
PubMed
Summary
This summary is machine-generated.

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Threshold Amsler grid testing significantly improves detection of visual field defects in maculopathy patients. This sensitive method enhances diagnosis for central vision disorders when standard tests fail.

Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Standard Amsler grid testing uses suprathreshold targets, potentially missing subtle visual field defects like relative scotomas.
  • Macular disorders can present with normal results on conventional Amsler grid tests.

Observation:

  • A modified Amsler grid test utilizing cross-polarizing filters to create low luminance conditions (threshold Amsler grid testing) was employed.
  • Ten patients with maculopathies, initially showing normal results with standard Amsler grids, were evaluated.

Findings:

  • Threshold Amsler grid testing identified visual field defects in 12 out of 15 affected eyes.
  • These findings were corroborated by tangent screen examinations in 10 of the 12 eyes.
  • Metamorphopsia observed with standard white grids was localized to areas of visual field defects under threshold testing.

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Implications:

  • Threshold Amsler grid testing is a highly sensitive and rapid method for assessing the central 10 degrees of the visual field.
  • This technique offers improved diagnostic capabilities for patients with maculopathies, particularly when standard tests are inconclusive.
  • Enhanced detection of scotomas can lead to earlier intervention and management of macular diseases.