title: The results of screening frequency doubling technology perimetry in different locations of the community.
abstract: OBJECTIVE
  To determine the effect of screening location on the frequency of abnormal test results with Frequency Doubling Technology (FDT) perimetry.
  
  
  METHODS
  Retrospective cross-sectional study.
  
  
  METHODS
  The Vision Screening Outreach Project conducted FDT testing in community sites surrounding Portland, Oregon. The sites were separated into a specific location type: health care clinics, work sites, senior centers, festivals/fairs, food banks/shelters, and other locations. These locations were compared for differences in the proportion of screening failures.
  
  
  METHODS
  Screening failure (defined as a repeatable, abnormal FDT result in either eye).
  
  
  RESULTS
  There were 9052 participants from 211 locations in Oregon and Washington. On initial FDT testing, the right and left eye had abnormal results in 18% (1654/9052) and 21% (1918/9052) of participants. Of those with abnormal FDT results, approximately 30% of eyes reverted to normal on repeat testing. Overall, 13% of participants were screening failures. Screening failure was highly associated with age (P<0.001). After controlling for age, participants at senior centers (P<0.001) were most likely to be screening failures and participants at work sites (P=0.006) were least likely to be screening failures when compared with health clinics.
  
  
  CONCLUSIONS
  An investigator should repeat an initially abnormal FDT result when screening with FDT. Age and the location of testing influence the probability of a screening failure. Screening in senior centers is most likely to result in screening failure. However, only a randomized controlled trial can determine the true benefit of FDT screening in these locations.
authors.affiliation: Devers Eye Institute/Discoveries in Sight, Portland, OR 97210, USA. smansberger@discoveriesinsight.org
authors.forename: Steven L
authors.initials: SL
authors.lastname: Mansberger
authors.forename: Chris A
authors.initials: CA
authors.lastname: Johnson
authors.forename: George A
authors.initials: GA
authors.lastname: Cioffi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003153:Community Health Services / Q000379:methods* / Q000458:organization & administration; D003430:Cross-Sectional Studies; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D014786:Vision Disorders / Q000175:diagnosis*; D015351:Vision Screening / Q000379:methods* / Q000458:organization & administration; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields