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Recovery of reliability by retest after a 5-minute interval in frequency doubling technology perimetry
Hidetoshi Tsukamoto1, Satoshi Mukai2, Aiko Iwase3
1Department of Ophthalmology and Visual Sciences, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan. htsuka@hiroshima-u.ac.jp.
Purpose:
In frequency doubling technology (FDT) perimetry, the incidence of tests classified as unreliable is higher in the second-tested left eye than in the first-tested right eye when perimetry is performed without a rest period. The purpose of this study was to determine whether the incidence of unreliable results was reduced when the retest began after a 5-min rest period.
Methods:
The subjects were 978 residents of Miyoshi City, Japan, who underwent FDT perimetry during a medical checkup. FDT perimetry was always performed first on the right eye and then on the left eye without a rest interval. When the results were determined to be unreliable, FDT perimetry was repeated after a 5-min rest interval.
Results:
The perimetric results were determined to be unreliable in one eye of 119 subjects; the results of the first-tested right eye were unreliable in 24 (20.2%), and the results of the second-tested left eye were unreliable in 95 (79.8%) subjects. This difference in the incidence of reliability was significant (P<0.001). After a 5-min rest interval, the percentage of eyes with reliable results recovered to 92% of the right eyes and to 86% of the left eyes.
Conclusions:
The incidence of unreliable results in FDT perimetry of the second-tested left eye was higher than that of the first-tested right eye when tests were performed without a rest interval. However, the incidence of unreliability in the eye was decreased when the retest was performed after a 5-min rest interval.
