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Related Experiment Videos

Threshold Amsler grid testing in diabetic retinopathy.

K A Wolfe1, A A Sadun

  • 1Department of Ophthalmology, University of Southern California School of Medicine, Los Angeles.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 1, 1991
PubMed
Summary

The threshold Amsler grid (TAG) test significantly improves detection of central visual field defects in diabetic retinopathy patients. This sensitive method identifies more scotomas than the standard Amsler grid, aiding in early diagnosis.

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Area of Science:

  • Ophthalmology
  • Visual Science

Background:

  • The standard Amsler grid assesses the central visual field but may miss subtle scotomas.
  • Diabetic retinopathy can cause central visual field defects that are difficult to detect with conventional methods.

Observation:

  • A modified threshold Amsler grid (TAG) test was developed using cross-polarizing filters to reduce luminance.
  • Twenty-six patients with diabetic retinopathy were evaluated using the standard Amsler grid, TAG test, and tangent screen.

Findings:

  • The TAG test detected 22 scotomas, significantly more than the standard Amsler grid (4 scotomas).
  • Tangent screen confirmed 9 of the scotomas identified by TAG.
  • Pathology seen in fundus photography and fluorescein angiography correlated with TAG-detected scotomas.

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Implications:

  • The TAG test is a sensitive and high-yield tool for assessing central visual fields in diabetic retinopathy.
  • This enhanced testing method can improve the detection of visual field abnormalities in patients with diabetes.
  • TAG testing offers a rapid and effective approach to identifying visual impairments in clinical settings.