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Article
April 1989

Agreement Between Clinicians and an Image Analyzer in Estimating Cup-to-Disc Ratios

Author Affiliations

From the William A. and Anna V. Goldberg Glaucoma Service and Research Laboratory, Wills Eye Hospital, Thomas Jefferson University, Philadelphia (Drs Varma, Spaeth, and Katz); and the Clinical Epidemiology Unit, Section of General Medicine, University of Pennsylvania and the Veterans Administration Hospital, Philadelphia (Dr Steinmann).

Arch Ophthalmol. 1989;107(4):526-529. doi:10.1001/archopht.1989.01070010540027
Abstract

• We studied optic disc photographs of 35 eyes to determine the level of agreement between estimates of vertical and horizontal cup-to-disc ratios (CDRs) provided by two clinicians and estimates of these ratios obtained using an image analyzer. We also evaluated the agreement of each clinician with himself and with the other clinician to provide a relative standard by which to judge agreement between the clinicians and the image analyzer. Agreement between the clinicians and the image analyzer was moderate. Differences of more than 0.2 disc diameters (DD) between the CDR estimates of clinicians and those obtained using the image analyzer were limited to discs having small (CDR of 0.4 DD or lower) or very large (CDR of 0.9 DD or higher) cups. The clinicians' agreement with themselves and with each other was substantial to near perfect.

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