title: Correlations in series of perimetric performance values.
abstract: 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.
authors.affiliation: Department of Experimental Ophthalmology, University Eye Clinic, Malmö, Sweden.
authors.forename: C E
authors.initials: CE
authors.lastname: Krakau
mesh_terms: D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure; D008954:Models, Biological; D015203:Reproducibility of Results; D058609:Visual Field Tests / Q000379:methods*