Journal article

Measurement error of visual field tests in glaucoma

PGD Spry, CA Johnson, AM McKendrick, A Turpin

BRITISH JOURNAL OF OPHTHALMOLOGY | BRITISH MED JOURNAL PUBL GROUP | Published : 2003

Abstract

AIM: Psychophysical strategies designed for clinical visual field testing produce rapid estimates of threshold with relatively few stimulus presentations and so represent a trade-off between test quality and efficiency. The aim of this study was to determine the measurement error of a staircase algorithm similar to full threshold with standard automated perimetry (SAP) and frequency doubling perimetry (FDP) in glaucoma patients. METHODS: Seven patients with early open angle glaucoma (OAG) were prospectively recruited. All were experienced in laboratory based psychophysics. Three matched test locations were examined with SAP (externally driven Humphrey field analyser) and FDP (CRT) in a singl..

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