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. 1995 Mar;79(3):213-7.
doi: 10.1136/bjo.79.3.213.

New approach to estimating variability in visual field data using an image processing technique

D P Crabb  1 , D F Edgar, F W Fitzke, A I McNaught, H P Wynn
Affiliations

New approach to estimating variability in visual field data using an image processing technique

D P Crabb et al. Br J Ophthalmol. 1995 Mar.

Abstract

Aims: A new framework for evaluating pointwise sensitivity variation in computerised visual field data is demonstrated.

Methods: A measure of local spatial variability (LSV) is generated using an image processing technique. Fifty five eyes from a sample of normal and glaucomatous subjects, examined on the Humphrey field analyser (HFA), were used to illustrate the method.

Results: Significant correlation between LSV and conventional estimates--namely, HFA pattern standard deviation and short term fluctuation, were found.

Conclusion: LSV is not dependent on normals' reference data or repeated threshold determinations, thus potentially reducing test time. Also, the illustrated pointwise maps of LSV could provide a method for identifying areas of fluctuation commonly found in early glaucomatous field loss.

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