Abstract
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).
| Original language | English |
|---|---|
| Pages (from-to) | 643-650 |
| Number of pages | 8 |
| Journal | American Journal of Ophthalmology |
| Volume | 108 |
| Issue number | 6 |
| State | Published - Dec 15 1989 |
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ASJC Scopus subject areas
- Ophthalmology
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The influence of decreased retinal illumination on automated perimetric threshold measurements. / Heuer, Dale K.; Anderson, Douglas; Feuer, William J; Gressel, Michael G.
In: American Journal of Ophthalmology, Vol. 108, No. 6, 15.12.1989, p. 643-650.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The influence of decreased retinal illumination on automated perimetric threshold measurements
AU - Heuer, Dale K.
AU - Anderson, Douglas
AU - Feuer, William J
AU - Gressel, Michael G.
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).
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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 -