TY - JOUR
T1 - Calibration of the Dicon auto perimeter 2000 compared with that of the Goldmann perimeter
AU - Hart, W. M.
AU - Gordon, M. O.
N1 - Funding Information:
From the Department of Ophthalmology, Washington University School of Medicine, St. Louis, Missouri. This study was supported in part by grants EY-02044 (Dr. Hart) and EY-03703 (Dr. Hart) from the National Eye Institute.
PY - 1983
Y1 - 1983
N2 - We empirically evaluated the calibration of the Dicon Auto Perimeter 2000 by comparing the results of threshold static perimetry with those for the same group of normal subjects examined by conventional manual static perimetry with the Goldmann perimeter. At 10 to 20 degrees of eccentricity in the visual field (including the entire Bjerrum region), there was no significant difference between threshold levels expressed as Goldmann equivalent stimuli by the Dicon instrument and the results obtained by examination with the Goldmann perimeter. The slopes of the linear meridional profiles from the two instruments were significantly different, however. The slope of the profile measured with the Dicon perimeter was flatter than that produced by Goldmann perimetry, so that threshold values inside 10 degrees of eccentricity were higher, whereas threshold values outside of 20 degrees of eccentricity were lower. Though statistically significant, these differences were small (2 dB at most). The difference in slopes can be attributed to a difference in stimulus sizes, because the area of the Dicon stimulus is eight times that of the size I Goldmann test object and twice that of the size II test object.
AB - We empirically evaluated the calibration of the Dicon Auto Perimeter 2000 by comparing the results of threshold static perimetry with those for the same group of normal subjects examined by conventional manual static perimetry with the Goldmann perimeter. At 10 to 20 degrees of eccentricity in the visual field (including the entire Bjerrum region), there was no significant difference between threshold levels expressed as Goldmann equivalent stimuli by the Dicon instrument and the results obtained by examination with the Goldmann perimeter. The slopes of the linear meridional profiles from the two instruments were significantly different, however. The slope of the profile measured with the Dicon perimeter was flatter than that produced by Goldmann perimetry, so that threshold values inside 10 degrees of eccentricity were higher, whereas threshold values outside of 20 degrees of eccentricity were lower. Though statistically significant, these differences were small (2 dB at most). The difference in slopes can be attributed to a difference in stimulus sizes, because the area of the Dicon stimulus is eight times that of the size I Goldmann test object and twice that of the size II test object.
UR - http://www.scopus.com/inward/record.url?scp=0021019181&partnerID=8YFLogxK
U2 - 10.1016/S0002-9394(14)71918-X
DO - 10.1016/S0002-9394(14)71918-X
M3 - Article
C2 - 6660263
AN - SCOPUS:0021019181
SN - 0002-9394
VL - 96
SP - 744
EP - 750
JO - American journal of ophthalmology
JF - American journal of ophthalmology
IS - 6
ER -