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(Investigative Ophthalmology and Visual Science. 2005;46:1540-1548.)
© 2005 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.04-0968
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Characteristics of the Normative Database for the Humphrey Matrix Perimeter

Andrew John Anderson,1 Chris A. Johnson,1 Murray Fingeret,2 John L. Keltner,3 Paul G. D. Spry,4 Michael Wall,5 and John S. Werner3

1From Discoveries in Sight, Devers Eye Institute, Portland, Oregon; the 2Department of Optometry, The VA NY Health Care System, Brooklyn, New York; the 3Department of Ophthalmology, University of California Davis, Sacramento, California; the 4Bristol Eye Hospital, Bristol, United Kingdom; and the 5Department of Neurology, University of Iowa College of Medicine, Iowa City, Iowa.

PURPOSE. The Humphrey Matrix (Carl Zeiss Meditec, Dublin CA; Welch-Allyn, Skaneateles, NY) is a high-spatial-resolution perimeter that uses frequency-doubling stimuli. It incorporates an efficient test strategy that assumes that age, eccentricity, and test procedure type have only small effects on sensitivity. The results used to create the normative database for the perimeter were examined, to see whether these assumptions were met and to examine the form of the normative data.

METHOD. Visual fields were measured (Matrix 30-2, 24-2, 10-2 and Macula patterns) in >275 subjects judged to be normal by a battery of clinical procedures. The right eye was always tested first.

RESULTS. Sensitivity decreased by approximately 0.7 dB per age decade across all eccentricities; sensitivity decreased with eccentricity, typically by <5 dB at the most peripheral points tested. Although there was no systematic difference in sensitivity between the 30-2 and 24-2 tests, the Macula test sensitivities were typically 1 dB higher than for the 10-2 test. Sensitivity in the left eye was slightly lower than in the right, with the difference being significantly greater in the temporal visual field. In most test locations, the 95% confidence interval of normal sensitivity was approximately 6 dB below the median sensitivity.

CONCLUSIONS. The performance of the test strategy in the Matrix perimeter is appropriately matched to the response characteristics of the normal population. The finding of a spatially nonuniform difference in sensitivity between left and right eyes is attributable to light-adaptation differences between the eyes. This effect is accounted for in the perimeter’s normative database.




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