New approach to estimating variability in visual field data using an image processing technique. Issue 3 (March 1995)

• Record Type: Journal Article
• Authors: Crabb, D P; Edgar, D F; Fitzke, F W; McNaught, A I; Wynn, H P
• Is Part Of: British journal of ophthalmology. Volume 79:Issue 3(1995)
• Page Start: 213
• Page End: 217
• Publication Date: 1995-03
• Subjects: Ophthalmology -- Periodicals; 617.7
• DOI: 10.1136/bjo.79.3.213
• Languages: English
• ISSNs: 0007-1161

Abstract

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.