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Related Experiment Videos

Macular perimetry in low vision.

Samuel N Markowitz1, Charlene Muller

  • 1Low Vision Clinic, Department of Ophthalmology, University of Toronto, Toronto, Ont. snm@aibn.com

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|March 26, 2004
PubMed
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Macular perimetry results are valid in low vision patients with residual sight. Eccentric fixation is common and should be considered during interpretation of perimetric data.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Low Vision Research

Background:

  • Detecting residual visual function is crucial for effective vision rehabilitation.
  • Macular perimetry offers valuable insights into visual function in low vision.
  • Accurate fixation is essential for validating perimetric test results.

Purpose of the Study:

  • To assess the validity of perimetric test results in low vision patients.
  • To examine the relationship between scotoma location, fixation stability, and visual acuity.
  • To determine the reliability of macular perimetry in individuals with reduced vision.

Main Methods:

  • A prospective observational case series was conducted.
  • Macular perimetry was performed using the Humphrey Automated Perimeter.

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  • Data collected included scotoma location, fixation maintenance, and visual acuity.

    • Main Results:

    • 46 eyes of 46 patients were analyzed.
    • 51.4% of eyes with visual acuity of 20/200 or better demonstrated acceptable fixation maintenance.
    • 88.6% of eyes exhibited eccentric scotoma patterns, indicating a new preferred retinal locus.

    Conclusions:

    • Acceptable fixation is achievable in low vision patients with residual acuity of 20/200 or better.
    • Eccentric fixation is common and influences scotoma pattern recording in perimetry.
    • Perimetric results in these cases are valid when eccentric fixation is considered in interpretation.