Pseudo-loss of Fixation in Automated Perimetry

Olga Sanabria, William J. Feuer, Douglas R. Anderson

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

During automated perimetry with the Humphrey Visual Field Analyzer, field examinations are labeled unreliable whenever the reported rate of fixation loss is 20% or more. The reported rate of fixation loss results in part from times when the patient's gaze drifts from the fixation point during the examination, but also in part from technical artifacts such as faulty initial localization of the blind spot or false-positive responses by the patient. It was found that technical artifacts caused nearly half of the instances in which a field examination had a reported fixation loss rate of greater than 20%. It was also found that the perimetrist can prevent the artifacts, with the result that the frequency of field examinations labeled as having excessive fixation loss fell from 26% to 14%.

Original languageEnglish (US)
Pages (from-to)76-78
Number of pages3
JournalOphthalmology
Volume98
Issue number1
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

  • Ophthalmology

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    Sanabria, O., Feuer, W. J., & Anderson, D. R. (1991). Pseudo-loss of Fixation in Automated Perimetry. Ophthalmology, 98(1), 76-78. https://doi.org/10.1016/S0161-6420(91)32338-8