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Related Experiment Videos

Frequency-doubling technology perimetry.

Andrew J Anderson1, Chris A Johnson

  • 1Discoveries in Sight, Devers Eye Institute, 1225 NE Second Avenue, Portland, OR 97232, USA.

Ophthalmology Clinics of North America
|June 18, 2003
PubMed
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The Frequency Doubling Technology (FDT) perimeter is effective for screening glaucoma and neuro-ophthalmic disorders. Further development is needed to improve its utility for detecting retinal disease and monitoring visual field progression.

Area of Science:

  • Ophthalmology
  • Optometry
  • Neuroscience

Background:

  • The Frequency Doubling Technology (FDT) perimeter offers a portable and rapid method for visual field screening.
  • Its tolerance to refractive errors and quick testing (<1 minute/eye) enhance its suitability for clinical use.

Purpose of the Study:

  • To evaluate the efficacy of the FDT perimeter in detecting various visual field defects.
  • To assess its potential for screening glaucoma, neuro-ophthalmic disorders, and retinal diseases.
  • To determine its utility in staging and monitoring visual field damage progression.

Main Methods:

  • Utilized the C-20-1 and C-20-5 screening protocols of the FDT perimeter.
  • Assessed sensitivity and specificity for detecting moderate to severe glaucoma.

Related Experiment Videos

  • Evaluated performance in identifying neuro-ophthalmic disorders and retinal diseases.
  • Considered the practicality of using FDT for staging and monitoring visual field progression.

    • Main Results:

    • The C-20-1 protocol shows good sensitivity and specificity for moderate/severe glaucoma; C-20-5 improves sensitivity.
    • FDT demonstrates good sensitivity and specificity for neuro-ophthalmic disorders but may struggle with hemianopic defect determination.
    • Limited evidence supports FDT's ability to detect retinal disease.
    • Current FDT's large targets limit its practicality for staging and monitoring visual field damage progression.

    Conclusions:

    • The FDT perimeter is a valuable tool for visual field screening, particularly for glaucoma and neuro-ophthalmic conditions.
    • Enhancements, such as smaller targets and narrower spacing, are recommended to improve FDT's ability to assess the spatial extent of visual field defects and aid in monitoring.
    • Further research is needed to validate FDT's role in detecting retinal diseases.