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Rarebit perimetry: normative values and test–retest variability
Author(s) -
Chin CheeFang,
Yip Leonard W,
Sim Danny C,
Yeo Anna C
Publication year - 2011
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/j.1442-9071.2011.02555.x
Subject(s) - foveal , normative , medicine , test (biology) , visual field , ophthalmology , optometry , audiology , retinal , paleontology , philosophy , epistemology , biology
A bstract 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 ± 13.95% for the central field and 91.6 ± 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 ± 12.3% and 98.2 ± 3.7% respectively, in ‘young’ subjects, and 81.9 ± 15.6% and 85.0 ± 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.