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Related Experiment Videos

Validity and interpretation of Amsler grid reports

R A Schuchard1

  • 1Lions Vision Center, Wilmer Institute, Johns Hopkins University School of Medicine, Baltimore, Md.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|June 1, 1993
PubMed
Summary

Amsler grid testing shows poor accuracy in detecting macular scotomas. Many visual field defects, especially smaller ones, are missed, questioning its clinical diagnostic value for retinal defects.

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Area of Science:

  • Ophthalmology
  • Visual Science

Background:

  • The Amsler grid is a common tool for assessing macular function.
  • Accurate detection of scotomas and metamorphopsia is crucial for diagnosing retinal diseases.

Purpose of the Study:

  • To compare Amsler grid test results with objective fundus perimetry findings.
  • To evaluate the reliability of Amsler grid testing for macular scotomas.

Main Methods:

  • Compared Amsler grid reports (standard and threshold) with fundus perimetry.
  • Tested 55 patients with macular vision loss and 10 controls.
  • Utilized scanning laser ophthalmoscope and TA-300 system.

Main Results:

  • Nearly half of all scotomas were not detected by the Amsler grid.
  • 77-87% of smaller scotomas (≤6 degrees) were missed.
  • Over half of reported distortions corresponded to actual scotoma locations.

Conclusions:

  • Amsler grid reports demonstrate poor validity for clinical diagnosis.
  • The Amsler grid is unreliable for accurately interpreting retinal defects.

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