Estimation of the short-term fluctuation from a single determination of the visual field.

Abstract:

:The short-term fluctuation in regular grid threshold static fields is commonly determined from repeated observations of a number of threshold points. In this study we estimated the short-term fluctuation from a single determination of the field. Sixty-two eyes of 62 patients were tested, using three consecutive repetitions of a Humphrey 24-2 full threshold program. The resulting grid patterns were examined using a modified version of the statistical technique of trend-surface analysis. Polynomial surfaces of increasing degree were fitted to the data over the grid. The residual variances after detrending the surface correlated very well with the direct estimates based on the triple observations at each point (correlation coefficients of log-transforms of 0.8 and better). We conclude that short-term fluctuation (the square root of the variance) can be estimated with good reliability from grids of single threshold determinations.

authors

Schulzer M,Mills RP,Hopp RH,Lau W,Drance SM

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

730-5

issue

4

eissn

0146-0404

issn

1552-5783

journal_volume

31

pub_type

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