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Does frequency doubling technology perimetry reliably detect neurological visual field defects?

K C S Fong1, D B Byles, P H Constable

  • 1Department of Ophthalmology, Royal Berkshire Hospital, Reading, UK. fongcsk@yahoo.co.uk

Eye (London, England)
|May 2, 2003
PubMed
Summary

Frequency Doubling Technology (FDT) perimetry may miss neurological visual field defects. This screening test can fail to detect complete hemianopic and quadrantanopic field losses, requiring user awareness.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Medical Imaging

Background:

  • Visual field defects can arise from neurological conditions.
  • Frequency Doubling Technology (FDT) perimetry is a screening tool used in ophthalmology.
  • Assessing the sensitivity of FDT for detecting neurological visual field defects is crucial.

Purpose of the Study:

  • To evaluate the effectiveness of Frequency Doubling Technology (FDT) perimetry in identifying visual field defects of neurological origin.
  • To compare FDT screening results with Humphrey visual field testing in patients with known defects.

Main Methods:

  • 15 eyes with confirmed hemianopias or quadrantanopias were tested using FDT 20-5 screening mode and Humphrey 24-2 SITA Fast visual field test (HFA).
  • FDT results were analyzed based on abnormal test locations (P<2%) within affected quadrants or hemifields.

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  • Defect detection rates were calculated for quadrantanopic and hemianopic defects.

    • Main Results:

    • FDT identified abnormalities in only 40% of the tested locations across all defects.
    • For quadrantanopic defects, FDT detected abnormalities in 21% of locations.
    • For hemianopic defects, FDT detected abnormalities in 49% of locations, and failed to detect any abnormality in 3 out of 15 eyes.

    Conclusions:

    • The FDT screening test demonstrates limitations in detecting complete hemianopic and quadrantanopic visual field defects.
    • Healthcare providers should exercise caution and be aware of FDT's potential deficiencies when screening for neurological visual field loss.
    • Further investigation into the diagnostic accuracy of FDT for specific neurological conditions may be warranted.