The influence of decreased retinal illumination on automated perimetric threshold measurements

Dale K. Heuer, Douglas R. Anderson, William J. Feuer, Michael G. Gressel

Research output: Contribution to journalArticle

16 Scopus citations

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 languageEnglish (US)
Pages (from-to)643-650
Number of pages8
JournalAmerican journal of ophthalmology
Volume108
Issue number6
DOIs
StatePublished - Dec 15 1989

ASJC Scopus subject areas

  • Ophthalmology

Fingerprint Dive into the research topics of 'The influence of decreased retinal illumination on automated perimetric threshold measurements'. Together they form a unique fingerprint.

Cite this