Probability Maps for Evaluating Automated Visual Fields

Schwartz, Bernard; Nagin, Paul

doi:10.1007/978-94-009-5512-7_6

Cited by 16 publications

(10 citation statements)

References 4 publications

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“…If probability plots were based on (incorrect) assumptions of constant variability and Gaussian distributions of normal measured thresholds across the central 30° field [12] they would offer no extra help as compared with the numerical deviation maps. If probability plots were based on (incorrect) assumptions of constant variability and Gaussian distributions of normal measured thresholds across the central 30° field [12] they would offer no extra help as compared with the numerical deviation maps.…”

Section: Discussionmentioning

confidence: 99%

“…Several such methods and programmes have been devised or suggested [1,4,5,10,11,12]. It is quite obvious that one may use the on-board computer of the perimeter not only to govern the test process itself, but also to help analyse the results of the visual field test by performing statistical analyses or by plotting the results in new ways intended to facilitate interpretation.…”

Section: Introductionmentioning

confidence: 99%

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A package for the statistical analysis of visual fields

Heijl

Lindgren

Olsson

1987

Documenta Ophthalmologica Proceedings Series

194

166

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We have devised a package for the statistical analysis of computerized visual fields. It is based on a new mathematical model of the normal visual field and intended to facilitate interpretation of single fields and to illustrate changes over time in consecutive threshold fields. Single field analyses include maps showing pointwise total and pattern deviations from the age-corrected normal reference field. These maps are displayed both numerically, in dB, and as noninterpolated greyscaled probability maps illustrating the statistical significance of measured deviations. These probability maps help emphasize shallow, but significant, depressions in the paracentral field while frequently occurring false positive deviations occurring in the midperiphery are de-emphasized. Visual field indices, summarizing the deviations of height (Mean Deviation) and shape (Pattern Standard Deviation and Corrected Pattern Standard Deviation) of the measured field are weighted according to the normal variance among healthy individuals and printed out together with level of statistical significance. For follow-up the programme contains several different options. These range from an Overview format where threshold printouts and probability maps from several tests are printed in reduced size, but without any reduction of data, on a single sheet of paper, to a box plot format where the development of the field is shown with an intermediate degree of data reduction and a format employing a high degree of data reduction: graphs over visual field indices over time. If five or more tests are available a linear regression analysis of Mean Deviation is automatically performed. The programme will become available in the Humphrey Field Analyzer.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A package for the statistical analysis of visual fields

Heijl

Lindgren

Olsson

1987

Documenta Ophthalmologica Proceedings Series

194

166

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“…Any effort to divide the visual field into sectors and areas related to the retinal nerve fiber bundles [4][5][6][7][8] had to be based solely on anatomical studies. But such studies are complicated and results vary, as Ballantyne's overview showed [9].…”

Section: Introductionmentioning

confidence: 99%

A perimetric nerve fiber bundle map

Weber

Ulrich

1991

Int Ophthalmol

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The so-called 'nerve fiber bundle defects' in the visual field are considered as being the functional equivalent of retinal nerve fiber bundle damage. This study examines the course and the position of scotoma borders in 159 visual fields with complete nerve fiber bundle defects using high resolution test point patterns. The scotoma border lines were averaged geometrically. The result is presented in the form of mean vectors. This functional map of nerve fiber lines shows a close correspondence to the anatomical course of the retinal nerve fibers. To make the result suitable for topographical analysis of visual fields, 21 areas ('Perimetric Nerve Fiber Bundles') are defined. Certain arbitrary assumptions were necessary because data were to scanty in some nasal regions. Also, the lines had to be fitted into a rectangular grid to be transferable to standard perimetric patterns. Topographical analysis on the basis of these areas may be useful for the evaluation of visual fields, particularly those of glaucoma.

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“…, 2002). Several algorithms, such as the global indices, exist to enable the detection of pathological perimetries (Schwartz and Nagin, 1985; Brenton and Phelps, 1986).…”

Section: Introductionmentioning

confidence: 99%