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Abstract #18464 Published in IGR 3-3
Long-term fluctuation in short-wavelength automated perimetry in glaucoma suspects and glaucoma patients
Hutchings N; Hosking SL; Wild JM; Flanagan JGInvestigative Ophthalmology and Visual Science 2001; 42: 2332-2337
PURPOSE: To determine the magnitude of the homogenous, LF(Ho), and heterogeneous, LF(Hc), components of the long-term fluctuation (LF) in glaucoma suspects and in stable primary open-angle glaucoma (POAG) patients undergoing short-wavelength automated perimetry (SWAP), and to compare the magnitude of the SWAP LF components with those elicited by standard white-on-white (W-W) perimetry. METHODS: The sample comprised 33 glaucoma suspects and 17 patients with early-to-moderate stable POAG, who underwent W-W perimetry and SWAP at each of six visits over a mean period of 12.75 months (SD, 2.29). The LF(Ho), LF(Hc), and error components of the long-term fluctuation were determined between the third and seventh visual field examinations. The intervening visual field examinations and optic nerve head parameters, derived both by stereo observation and the Heidelberg Retinal Tomograph, were used to confirm stability over the follow-up period. RESULTS: The LF(Ho) and LF(Hc) components were larger in the POAG patients than in the glaucoma suspects for both W-W perimetry and SWAP; the magnitude was independent of the depth of defect and of the short-term fluctuation. All three components of LF were greater for SWAP than for W-W perimetry, both in the glaucoma suspects and the POAG patients. CONCLUSIONS: SWAP exhibits greater LF than W-W perimetry. The usefulness of SWAP will be limited if the extent of this variability is not overcome in future statistical procedures developed to detect progressive visual field loss.
Dr N. Hutchings, School of Optometry, University of Waterloo, Waterloo, Ontario N2L 3GL, Canada. nhutchin@sciborg.uwaterloo.ca
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)
