AAO Free Paper: PA059: Field-Balanced Multifocal Objective Perimetry
AAO 2009 Annual Meeting, San Francisco, CA, October 24-27, 2009
Presentation: Monday Oct 26, 2009, 3:21 PM, Room NORTH 133
Background
Perimeters have poor repeatability and reliability. In an attempt to ameliorated these problems we developed a rapid, objective, noncontact multifocal perimeter. Data is not collected during fixation losses or blinks. Here we improve the method.
Precis
This study seeks to improve a new FDA approved, non-contact, objective perimeter: the TrueField Analyzer, which simultaneously assesses 44 visual field regions of each eye in 4 to 6 minutes recording time; response amplitude (sensitivity), response delay, measurement error, and data on afferent and efferent pupil defects, are provided at every field location; a 20% improvement in reliability and excellent diagnostic accuracy was obtained.
Abstract
Authors
T. Maddess., M. Kolic, R.W. Essex, A.C. James
ARC Centre of Excellence in Vision Science, Dept Ophthalmology The Canberra Hospital, Australian National University, Canberra, Australia.
Purpose
To compare 8 TrueField Analyzer methods.
Methods
Two blocks of trials contained 41 normal and 47 glaucoma subjects, and 40 normals and 39 patients. We compared 4 or 6 min stimulus durations and 2 methods of balancing luminances in an attempt to produce higher median reliability across the field as measured by t-statics for each field region. The dichoptic stimuli extended to 30 deg eccentricity. Maximum luminance and stimulus presentation rate were also varied. All subjects were also examined with Matrix and HFA perimetry, and Stratus OCT.
Results
The 44 region/eye, 1/s stimuli, gave areas under ROC plots of: moderate + severe fields of 0.86 ± 0.04, severe 0.98 ± 0.01. Median t-statistics improved by 20% to 3.28 ± 0.45.
Conclusion
High diagnostic accuracy and median t-stats were obtained from this improved binocular method.
Downloads
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Tags: AAO
