Calibration Error in Dark Adaptometer

John M. Maggiano, Gerald A. Fishman, Lawrence S. Evans, Paul Sieving, Michael Goldbaum

Research output: Contribution to journalArticlepeer-review


We noted that the adjustable fixation device present on some models of the Goldmann-Weekers dark adaptometer has a calibration error that results in a consistent and predictable overestimation of retinal eccentricity. The error occurs because the eye being tested is not in the geometric center of the projection sphere. The true retinal locus may be computed by trigonometric analysis. A conversion table is available for reference.

Original languageEnglish (US)
Pages (from-to)1082-1083
Number of pages2
JournalArchives of Ophthalmology
Issue number6
StatePublished - Jun 1978
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology


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