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S.L. Mansberger, C.A. Johnson, W.A. Butler, G.A. Cioffi; Screening With Frequency Doubling Technology Perimetry in a Metropolitan Community . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3413.
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Purpose: To report the results of visual field screening of a large, community-based study using Frequency Doubling Technology Perimetry (FDT). Methods: We used one of the FDT screening modes (C-20-5, C-20-1, N-30-5) or threshold modes (C-20 and N-30) for testing. We defined an abnormal result as one location of reduced sensitivity on the printout. We divided the screenings by location to determine access, age characteristics, and likelihood to have an abnormal FDT result. The categories for locations were health care clinics, work sites, senior centers, festivals/fairs, and foodbanks/shelters. Results: Over three years, we screened 9459 participants from 225 locations in Oregon and Washington. The age of the participants (mean +/- SD) was 53.4 +/- 17.2 years (range 10-99). On initial FDT testing, the right and left eye had abnormal results in 19% (1813/9459) and 22% (2104/9459) of participants. Of those with abnormal results, 38% (370/961) and 37% (442/1187) of right and left eyes, respectively had normal results on repeat testing. We found an abnormal, reliable result on initial and repeat testing in 5.4% (511/9459) and 5.9% (560/9459) of right and left eyes, respectively. When compared to other locations, community festivals recruited the largest numbers of participants per event. Senior center screenings recruited older participants (p<0.001) that were more likely to have abnormal results(p<0.05). Conclusions: An investigator should repeat an abnormal result to decrease the number of false positive test results with FDT in community screenings. To attract older adults more likely to have abnormal results, we recommend targeting retirement centers. To increase access for the greatest numbers of participants, we recommend targeting large community fairs. We need comprehensive research in community eye screening to determine the etiology of these abnormalities.
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