Identification of glaucoma-related visual field abnormality with the screening protocol of frequency doubling technology

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Abstract

PURPOSE: To evaluate the predictive power of frequency doubling technology to distinguish glaucoma suspects from persons with glaucoma visual field loss. METHODS: A consecutive series of 76 subjects referred to a glaucoma service underwent perimetry in one eye with frequency doubling technology in a screening mode and Humphrey 24-2 threshold testing in random order, and had optic disk and clinical nerve fiber layer grading. RESULTS: All subjects performed perimetry with both instruments satisfactorily, with an average test time of 1.8 ± 0.7 minutes per eye for the frequency doubling technology (instrument time). Of 33 eyes classified as abnormal by glaucoma hemifield test, 91% (30/33) were abnormal on frequency doubling technology (two or more abnormal locations of 17), whereas 94% (31/33) of glaucoma suspects with normal Humphrey fields had normal results with frequency doubling technology. Frequency doubling technology results were highly correlated with Humphrey mean deviation by linear regression (r2 = .74, P = .047) and with corrected pattern standard deviation probability value. A frequency doubling technology error score for each quadrant of the field was highly correlated with the number of severely abnormal points per quadrant in Humphrey threshold tests (r2 = .63, P = .034). There was close agreement between clinical examination of the optic disk and nerve fiber layer and frequency doubling technology results. Three-level quantification of abnormality in frequency doubling technology results did not add to diagnostic accuracy. CONCLUSION: Frequency doubling technology testing shows promise as a screening method in glaucoma.

Original languageEnglish (US)
Pages (from-to)819-829
Number of pages11
JournalAmerican Journal of Ophthalmology
Volume125
Issue number6
DOIs
StatePublished - Jun 1998

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Visual Fields
Glaucoma
Technology
Ocular Hypertension
Visual Field Tests
Optic Disk
Nerve Fibers
Optic Nerve
Linear Models

ASJC Scopus subject areas

  • Ophthalmology

Cite this

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title = "Identification of glaucoma-related visual field abnormality with the screening protocol of frequency doubling technology",
abstract = "PURPOSE: To evaluate the predictive power of frequency doubling technology to distinguish glaucoma suspects from persons with glaucoma visual field loss. METHODS: A consecutive series of 76 subjects referred to a glaucoma service underwent perimetry in one eye with frequency doubling technology in a screening mode and Humphrey 24-2 threshold testing in random order, and had optic disk and clinical nerve fiber layer grading. RESULTS: All subjects performed perimetry with both instruments satisfactorily, with an average test time of 1.8 ± 0.7 minutes per eye for the frequency doubling technology (instrument time). Of 33 eyes classified as abnormal by glaucoma hemifield test, 91{\%} (30/33) were abnormal on frequency doubling technology (two or more abnormal locations of 17), whereas 94{\%} (31/33) of glaucoma suspects with normal Humphrey fields had normal results with frequency doubling technology. Frequency doubling technology results were highly correlated with Humphrey mean deviation by linear regression (r2 = .74, P = .047) and with corrected pattern standard deviation probability value. A frequency doubling technology error score for each quadrant of the field was highly correlated with the number of severely abnormal points per quadrant in Humphrey threshold tests (r2 = .63, P = .034). There was close agreement between clinical examination of the optic disk and nerve fiber layer and frequency doubling technology results. Three-level quantification of abnormality in frequency doubling technology results did not add to diagnostic accuracy. CONCLUSION: Frequency doubling technology testing shows promise as a screening method in glaucoma.",
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AB - PURPOSE: To evaluate the predictive power of frequency doubling technology to distinguish glaucoma suspects from persons with glaucoma visual field loss. METHODS: A consecutive series of 76 subjects referred to a glaucoma service underwent perimetry in one eye with frequency doubling technology in a screening mode and Humphrey 24-2 threshold testing in random order, and had optic disk and clinical nerve fiber layer grading. RESULTS: All subjects performed perimetry with both instruments satisfactorily, with an average test time of 1.8 ± 0.7 minutes per eye for the frequency doubling technology (instrument time). Of 33 eyes classified as abnormal by glaucoma hemifield test, 91% (30/33) were abnormal on frequency doubling technology (two or more abnormal locations of 17), whereas 94% (31/33) of glaucoma suspects with normal Humphrey fields had normal results with frequency doubling technology. Frequency doubling technology results were highly correlated with Humphrey mean deviation by linear regression (r2 = .74, P = .047) and with corrected pattern standard deviation probability value. A frequency doubling technology error score for each quadrant of the field was highly correlated with the number of severely abnormal points per quadrant in Humphrey threshold tests (r2 = .63, P = .034). There was close agreement between clinical examination of the optic disk and nerve fiber layer and frequency doubling technology results. Three-level quantification of abnormality in frequency doubling technology results did not add to diagnostic accuracy. CONCLUSION: Frequency doubling technology testing shows promise as a screening method in glaucoma.

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