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Related Experiment Videos

The illuminated high contrast macular grid: a pilot study

L R Achiron1, N S Witkin, B McCarey

  • 1Emory University Eye Center, Department of Ophthalmology, Atlanta, Georgia 30322, USA.

Journal of the American Optometric Association
|November 1, 1995
PubMed
Summary

A novel Illuminated High Contrast Macular Grid (IHCMG) accurately assesses central visual field defects in low vision patients. This method is a simple, rapid alternative to automated perimetry and superior to conventional Amsler grids.

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Area of Science:

  • Ophthalmology
  • Low Vision Research
  • Visual Field Testing

Background:

  • Accurate assessment of central visual field defects is crucial for low vision clinicians.
  • Conventional Amsler grid testing presents challenges with visibility and result transcription for visually impaired patients.
  • Automated perimetry offers accuracy but is costly and time-consuming.

Purpose of the Study:

  • To evaluate the efficacy of a modified Amsler grid, the Illuminated High Contrast Macular Grid (IHCMG), for analyzing central visual field defects.
  • To compare the IHCMG technique with automated perimetry and conventional Amsler grid testing.

Main Methods:

  • Eighteen visually impaired patients (28 eyes) underwent three central threshold visual field tests.
  • Tests included automated perimetry (Humphrey 10-2), conventional Amsler Grid, and the IHCMG.

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  • Automated perimetry was used to map retinal function for comparison.

    • Main Results:

    • The IHCMG identified a similar number of defects (2.25 +/- 1.5) and defect area (26% +/- 20%) compared to automated perimetry (2.4 +/- 1.4 defects; 33.4% +/- 14.8% area), with no statistical difference (p > 0.05).
    • Conventional Amsler grid significantly under-evaluated defects compared to automated perimetry (p < 0.01 for number, p > 0.001 for area).

    Conclusions:

    • The IHCMG provides a simple, rapid, and accurate method for analyzing the central 10 degrees of the visual field in low vision patients.
    • IHCMG is a viable alternative to more complex and expensive automated perimetry systems.