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S. Mahdaviani, J. Olivier, O. Smith; Comparison of Reliability of Frequency Doubling Technology (FDT) and Humphrey Visual Field (HVF) in Children. Invest. Ophthalmol. Vis. Sci. 2008;49(13):1082.
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To compare reliability of HVF II and FDT perimetry in children age group of 5-18 year-old.
Twenty-five children in age group of Five to Eighteen years old underwent -visual field testing with C-20-5 screening program (FDT/VF software version 3.01.0) and a central 30-2 SITA- FAST standard automated perimetry with Humphrey Field Analyzer II in both eyes. The subjects were divided into four groups. Group A (age 5-7), Group B ( age 8-11), group C ( age 12-15) and group D ( 16-18 ). Reliability parameters (Fixation errors or false-positive errors was deemed unreliable when > 33% were flagged on the FDT printouts). Glaucoma hemifield analysis reliability criteria were established as less than 20% fixation losses, less than 33% false-negative error, and less than 33% false-positive error, as recommended by Humphrey Instruments, Inc (San Leandro, CA).
Average test time in performing both HVF and FDT decreased in older patients. Reliability for FDT perimetry was 75% in right eye and 100% in the left eye for group A, 87.5% for both eyes in group B, 41.6 % in the right eye and 70% in the left eye in group C and 100% in both eyes for group D. Nobody performed a reliable HVF test in group A, reliability was 50% in the right eye performing HVF and 37.5% in the left eye in group B, in group C 60% were able perform a reliable test in their right eye and 40% in their left eye, although 100% of the patients in group D performed a reliable HVF test.
Visual Field testing with FDT in the young age group is feasible. FDT was more reliable in children aged 8-11 compare with HVF. Pre-selection of children is suggested to achieve reliable results.
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