title: Identification of glaucoma-related visual field abnormality with the screening protocol of frequency doubling technology.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  Frequency doubling technology testing shows promise as a screening method in glaucoma.
authors.affiliation: Dana Center for Preventive Ophthalmology, The Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. hquigley@welchlink.welch.jhu.edu
authors.forename: H A
authors.initials: HA
authors.lastname: Quigley
mesh_terms: D000368:Aged; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009412:Nerve Fibers / Q000473:pathology; D009798:Ocular Hypertension / Q000175:diagnosis; D009898:Optic Disk / Q000473:pathology; D009900:Optic Nerve / Q000473:pathology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014786:Vision Disorders / Q000175:diagnosis*; D058609:Visual Field Tests / Q000295:instrumentation / Q000379:methods*; D014794:Visual Fields