Abstract
The effect of light scattering by ocular media opacities on OCTOPUS and Humphrey perimeter threshold measurements was simulated with randomly ordered sequences of six ground-glass diffusers in the right eyes of five subjects. Threshold measurements were performed at 0°, 5°, 10°, 15°, 20°, and 25° nasally along the 180° meridian with the F4 program on an OCTOPUS perimeter, and with twice-repeated profiles on a Humphrey perimeter. The reduction in differential light sensitivity correlated well with the 2.7-dB to 16.7-dB reduction in stimulus intensity caused by the 46% to 98% scattering of incident light by the diffusers. Contrast sensitivity in the presence of a glare source (Miller-Nadler glare test) was also affected by the diffusers, such that a 75% contrast target was not visible through the strongest diffuser whereas a 5% contrast target was visible without a diffuser. Conversely, the diffusers had very little effect on visual acuity measurements that were performed with projected high-contrast targets in a darkened room. Our data suggest that even minimal light scattering, such as might be caused by a cataract that has a relatively insignificant effect on visual acuity, may influence threshold measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 1247-1251 |
| Number of pages | 5 |
| Journal | Archives of Ophthalmology |
| Volume | 106 |
| Issue number | 9 |
| State | Published - Jan 1 1988 |
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ASJC Scopus subject areas
- Ophthalmology
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The influence of simulated light scattering on automated perimetric threshold measurements. / Heuer, D. K.; Anderson, Douglas; Knighton, R. W.; Feuer, William J; Gressel, M. G.
In: Archives of Ophthalmology, Vol. 106, No. 9, 01.01.1988, p. 1247-1251.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The influence of simulated light scattering on automated perimetric threshold measurements
AU - Heuer, D. K.
AU - Anderson, Douglas
AU - Knighton, R. W.
AU - Feuer, William J
AU - Gressel, M. G.
PY - 1988/1/1
Y1 - 1988/1/1
N2 - The effect of light scattering by ocular media opacities on OCTOPUS and Humphrey perimeter threshold measurements was simulated with randomly ordered sequences of six ground-glass diffusers in the right eyes of five subjects. Threshold measurements were performed at 0°, 5°, 10°, 15°, 20°, and 25° nasally along the 180° meridian with the F4 program on an OCTOPUS perimeter, and with twice-repeated profiles on a Humphrey perimeter. The reduction in differential light sensitivity correlated well with the 2.7-dB to 16.7-dB reduction in stimulus intensity caused by the 46% to 98% scattering of incident light by the diffusers. Contrast sensitivity in the presence of a glare source (Miller-Nadler glare test) was also affected by the diffusers, such that a 75% contrast target was not visible through the strongest diffuser whereas a 5% contrast target was visible without a diffuser. Conversely, the diffusers had very little effect on visual acuity measurements that were performed with projected high-contrast targets in a darkened room. Our data suggest that even minimal light scattering, such as might be caused by a cataract that has a relatively insignificant effect on visual acuity, may influence threshold measurements.
AB - The effect of light scattering by ocular media opacities on OCTOPUS and Humphrey perimeter threshold measurements was simulated with randomly ordered sequences of six ground-glass diffusers in the right eyes of five subjects. Threshold measurements were performed at 0°, 5°, 10°, 15°, 20°, and 25° nasally along the 180° meridian with the F4 program on an OCTOPUS perimeter, and with twice-repeated profiles on a Humphrey perimeter. The reduction in differential light sensitivity correlated well with the 2.7-dB to 16.7-dB reduction in stimulus intensity caused by the 46% to 98% scattering of incident light by the diffusers. Contrast sensitivity in the presence of a glare source (Miller-Nadler glare test) was also affected by the diffusers, such that a 75% contrast target was not visible through the strongest diffuser whereas a 5% contrast target was visible without a diffuser. Conversely, the diffusers had very little effect on visual acuity measurements that were performed with projected high-contrast targets in a darkened room. Our data suggest that even minimal light scattering, such as might be caused by a cataract that has a relatively insignificant effect on visual acuity, may influence threshold measurements.
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M3 - Article
C2 - 3415549
AN - SCOPUS:0023682316
VL - 106
SP - 1247
EP - 1251
JO - JAMA Ophthalmology
JF - JAMA Ophthalmology
SN - 2168-6165
IS - 9
ER -