title: Algorithm for interpreting the results of frequency doubling perimetry.
abstract: OBJECTIVE
  To evaluate an algorithm for the identification of glaucomatous visual field defects with the screening mode of frequency doubling technology.
  
  
  METHODS
  Screening-mode frequency doubling technology and Swedish interactive threshold algorithm perimetry were performed on 137 of 150 consecutive patients referred to a glaucoma specialist. We created an algorithm for the frequency doubling technology that gave increased importance to both more severe defects and defects closer to fixation. These values were then compared with the results of the Swedish interactive threshold algorithm visual fields evaluated by the glaucoma hemifield test, two masked glaucoma specialists, and a published definition of glaucomatous damage to determine sensitivity and specificity of the frequency doubling technology screening mode for detecting glaucoma.
authors.affiliation: Department of Ophthalmology, Greater Baltimore Medical Center, Baltimore, MD, USA.
authors.forename: S C
authors.initials: SC
authors.lastname: Patel
authors.forename: D S
authors.initials: DS
authors.lastname: Friedman
authors.forename: P
authors.initials: P
authors.lastname: Varadkar
authors.forename: A L
authors.initials: AL
authors.lastname: Robin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D003627:Data Interpretation, Statistical; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000175:diagnosis*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D014786:Vision Disorders / Q000175:diagnosis*; D014792:Visual Acuity; D058609:Visual Field Tests / Q000706:statistics & numerical data*; D014794:Visual Fields