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Abstract #46154 Published in IGR 13-2
Rarebit perimetry: Normative values and test-retest variability
Chin C-F; Yip LW; Sim DC; Yeo ACClinical and Experimental Ophthalmology 2011;
Abstract: Background: We aim to establish normative values and evaluate test-retest variability for the central and foveal field tests of version 4 of rarebit perimetry. Design: This was a prospective study undertaken in collaboration between Tan Tock Seng Hospital, Singapore, and Singapore Polytechnic. Participants: Fifty-four normal subjects were recruited and included in the study. Methods: Subjects underwent rarebit perimetry testing, studying the central and foveal fields. All subjects repeated the test within 1 month of the initial visit. The 'mean hit rates' of one eye of every subject were analysed. Main Outcome Measures: Mean hit rates of subjects were analysed to establish normative values for the central and foveal fields. Test-retest variability was also analysed. Results: Overall normative mean hit rates were 86.3(plus or minus)13.95% for the central field and 91.6(plus or minus)6.35% for the foveal field. For every increasing year of age, we found a 0.47% decrease in the central mean hit rates (P<0.001). Normative mean hit rate for central and foveal fields were 90.6(plus or minus)12.3% and 98.2(plus or minus)3.7% respectively, in 'young' subjects, and 81.9(plus or minus)15.6% and 85.0(plus or minus)9.0% respectively, in 'mature' subjects. We found no significant test-retest variability in the foveal field (P=0.554). There was significant test-retest variability in the central field (P<0.001), but the difference was a 3.5 unit mean hit rate increase, which may be clinically significant. Conclusions: Rarebit perimetry is repeatable and reliable. We have established normative values for two age groups.
C.-F. Chin. 11 Jalan Tan Tock Seng, Tan Tock Seng Hospital, Singapore 308433, . Email: chee-fang@yahoo.com
Classification:
6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
