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Abstract #19000 Published in IGR 3-1
Evaluation of advanced visual field defects by computer assisted perimetry
Schiefer U; Schiller J; Paetzold J; Dietrich TJ; Vonthein R; Besch DKlinische Monatsblätter für Augenheilkunde 2001; 218: 13-20
BACKGROUND: Conventional kinetic perimetry is of particular use in advanced scotoma. However, examiner-dependency is a major drawback. The purpose of this study was to evaluate the clinical feasibility and intraindividual scatter of computer-assisted kinetic perimetry in monitoring advanced visual field defects of various origins. METHODS: Examinations were carried out with the Tübingen Computer Campimeter (background luminance 10 cd/m2). In an initial session, localization of the scotoma border is estimated with conventional manual kinetic perimetry. In the subsequent computer-assisted kinetic mode, an individually adjusted set of vectors is designed. Each vector crosses the manually-assessed visual field defect border almost perpendicularly, starting approximately 3° within the scotoma. Each individual set of vectors can be stored and recalled for follow-up. Stimuli move along these vectors with identical characteristics as in manual kinetic perimetry. Stimulus presentations are repeated six times in a randomized order. Patients' responses are recorded and additionally corrected for mean individual reaction time. A 'local kinetic threshold' (mean) and a related parameter for dispersion (standard deviation) are assessed. RESULTS: Four subjects with advanced visual field loss of various origin (retinitis pigmentosa, vigabatrin-associated visual field defect, glaucomatous nerve fibre layer defect, and postgeniculate visual pathway defect) participated in the study. Maximum difference between manual-kinetic and automated kinetic thresholds reaches from 1.7-5°. Local scatter (standard deviation) of kinetic threshold, assessed by computer-assisted perimetry, varies between 0.1 and 3.0°. CONCLUSIONS: Computer-assisted kinetic perimetry is a new, useful, examiner-independent, reliable method for effective evaluation and monitoring of advanced visual field loss. LA: German
Dr U. Schiefer, Universitäts-Augenklinik, Abteilung für Pathophysiologie des Sehens und Neuroophthalmologie, Schleichstrasse 12-16, 72076 Tübingen, Germany
Classification:
6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
