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Correlations in series of perimetric performance values
Author(s) -
Krakau C. E. T.
Publication year - 1991
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1991.tb02058.x
Subject(s) - glaucoma , statistics , mathematics , sensitivity (control systems) , series (stratigraphy) , dispersion (optics) , random error , correlation , optometry , ophthalmology , medicine , optics , physics , geometry , geology , paleontology , electronic engineering , engineering
The correlation function for consecutive performance (P) values in a material of simple glaucoma is studied. The outcome of perimetry sessions recorded with about 2 min intervals are significantly correlated, whereas those obtained 2 h apart or more are not so. Partial correlations of the right and left P values as well as IOP and P value are estimated and discussed in connection with a statistical model for the sensitivity fluctuations. A slow trend, a random error component and an irregular undulation of sensitivity are discerned. The cause of the fluctuations as well as procedures for reducing the dispersion of performance values are discussed.