TY - JOUR
T1 - The influence of decreased retinal illumination on automated perimetric threshold measurements
AU - Heuer, Dale K.
AU - Anderson, Douglas R.
AU - Feuer, William J.
AU - Gressel, Michael G.
N1 - Funding Information:
From the Department of Ophthalmology, University of Southern California School of Medicine and the Doheny Eye Institute, Los Angeles, California (Dr. Heuer); Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami School of Medicine, Miami, Florida (Dr. Anderson and Mr. Feuer); and Lakeland Eye Surgeons and Consultants, Lorain, Ohio (Dr. Gressel). This study was conducted in part while Dr. Heuer was with the Department of Ophthalmology, University of Florida College of Medicine, Gainesville, Florida. This study was supported in part by the U.S. Department of Health and Human Services, Public Health Service National Research Service Award T32EY-07021 and Core Grant P30-EY-02180, awarded by the National Institutes of Health, National Eye Institute, Bethesda, Maryland; National Glaucoma Research, a program of the American Health Assistance Foundation, Beltsville, Maryland; and Research to Prevent Blindness, Inc., New York, New York.
PY - 1989/12/15
Y1 - 1989/12/15
N2 - Decreased retinal illumination (such as can be caused by pupillary constriction or light absorption by ocular media opacities) was simulated with a randomly ordered series of neutral density filters in front of the right eyes of five subjects with dilated pupils. Threshold measurements were performed on Humphrey and Octopus perimeters at 0, 5, 10, 15, 20, and 25 degrees nasally along the 180-degree meridian. A 0.6-log unit neutral density filter, which reduces retinal illumination the equivalent of halving the pupillary diameter, decreased the mean Humphrey thresholds by 1.1 ± 0.8 decibels (dB) (mean ± standard deviation) and the mean Octopus thresholds by 1.7 ± 1.4 dB. Statistically significant (P ≤ .05, Dunnett's test) threshold depressions were observed at all eccentricities with a 1.5-log unit neutral density filter on the Humphrey perimeter (-4.5 ± 0.7 dB) and with a 1.0-log unit neutral density filter on the Octopus perimeter (-3.5 ± 1.0 dB).
AB - Decreased retinal illumination (such as can be caused by pupillary constriction or light absorption by ocular media opacities) was simulated with a randomly ordered series of neutral density filters in front of the right eyes of five subjects with dilated pupils. Threshold measurements were performed on Humphrey and Octopus perimeters at 0, 5, 10, 15, 20, and 25 degrees nasally along the 180-degree meridian. A 0.6-log unit neutral density filter, which reduces retinal illumination the equivalent of halving the pupillary diameter, decreased the mean Humphrey thresholds by 1.1 ± 0.8 decibels (dB) (mean ± standard deviation) and the mean Octopus thresholds by 1.7 ± 1.4 dB. Statistically significant (P ≤ .05, Dunnett's test) threshold depressions were observed at all eccentricities with a 1.5-log unit neutral density filter on the Humphrey perimeter (-4.5 ± 0.7 dB) and with a 1.0-log unit neutral density filter on the Octopus perimeter (-3.5 ± 1.0 dB).
UR - http://www.scopus.com/inward/record.url?scp=0024820915&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024820915&partnerID=8YFLogxK
U2 - 10.1016/0002-9394(89)90855-6
DO - 10.1016/0002-9394(89)90855-6
M3 - Article
C2 - 2596543
AN - SCOPUS:0024820915
VL - 108
SP - 643
EP - 650
JO - American Journal of Ophthalmology
JF - American Journal of Ophthalmology
SN - 0002-9394
IS - 6
ER -