Scotomas of age-related macular degeneration detected and characterized by means of a novel three-dimensional computer-automated visual field test

Paul P. Nazemi, Wolfgang Fink, Jennifer I. Lim, Alfredo A. Sadun

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Purpose: We used the recently devised three-dimensional computer-based threshold Amsler grid test to acquire and identify typical patterns of visual field defects (scotomas) caused by age-related macular degeneration (AMD). Methods: Patients with AMD traced on a computer touch screen the borders of those areas on an Amsler grid that were missing from their field of vision. Scotomas were repeatedly outlined and recorded at different grid contrast levels. The resulting three-dimensional "hole" in the central 25° of the visual field was further characterized by its slope, location, shape, and depth. The results were compared with fundus photographs and fluorescein angiograms. Results: Twenty-five patients and 41 eyes were examined. The three-dimensional depictions consistently demonstrated central scotomas with "scallop"-shaped borders and steplike patterns, with either steep slopes or a combination of steep and shallow slopes. The steep slopes corresponded to nonexudative AMD, while the shallow slopes indicated exudative AMD. Conclusion: The three-dimensional computer-automated threshold Amsler grid test may demonstrate characteristic scotoma patterns in patients with AMD that conform to the respective fluorescein angiograms. The test shows promise as an effective tool in accurately evaluating, characterizing, and monitoring scotomas in patients with AMD. It may have the potential as a screening tool for the early diagnosis of AMD.

Original languageEnglish (US)
Pages (from-to)446-453
Number of pages8
JournalRetina
Volume25
Issue number4
DOIs
StatePublished - Jun 1 2005

Keywords

  • Age-related macular degeneration (AMD)
  • Amsler grid
  • Contrast sensitivity
  • Exudative AMD
  • Nonexudative AMD
  • Perimetry
  • Scotomas
  • Three-dimensional computer-based threshold Amsler grid test
  • Visual field testing
  • Visual fields

ASJC Scopus subject areas

  • Ophthalmology

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