Repeatability of Nidek MP-1 Fixation Measurements in Patients With Bilateral Central Field Loss

Investigative Ophthalmology & Visual Science
Harold E BedellLuminita Tarita-Nistor

Abstract

Visual performance in patients with bilateral central field loss is related to fixation stability. This study evaluated the repeatability of visual-fixation parameters in patients with bilateral central field loss, measured with the MP-1 microperimeter for fixation durations on the order of 15 to 30 seconds. Bivariate contour ellipse area (BCEA), and the eccentricity and meridian of the preferred retinal locus (PRL) were determined in 56 eyes of 56 patients, sampled at two investigational sites. Repeatability and agreement were assessed by estimating 95% limits of agreement for each parameter from two fixation examinations conducted on the same day. The 95% confidence intervals (CI) for log BCEA and for PRL eccentricity and meridian were ±0.67 log deg2, ±2.0°, and ±65.9°, respectively. Each CI decreased substantially if a small number of outlying data points were excluded. For all parameters, the mean difference between the two fixation examinations was close to zero. For most patients with bilateral central field loss, the repeatability of estimated BCEA and PRL eccentricity and meridian is good. When repeated estimates of fixation parameters do not agree, the absence of a well-developed PRL or the use of multiple PRLs may be ...Continue Reading

Citations

Mar 20, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Serena FragiottaEnzo Maria Vingolo
Oct 4, 2017·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Arun Kumar Krishnan, Harold E Bedell
Jun 12, 2018·American Journal of Ophthalmology·Etienne M SchönbachUNKNOWN ProgStar Study Group

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