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Learning effect among perimetric novices with screening C-20-1 frequency doubling technology perimetry
Michael B Brush1, Philip P Chen
1Department of Ophthalmology, University of Washington, Seattle, Washington 98195-6485, USA. pchen@u.washington.edu
Purpose:
To investigate whether perimetric novices without glaucoma demonstrate a learning effect using screening-mode frequency doubling technology perimetry.
Design:
Prospective observational study.
Methods:
The study included 101 healthy subjects who had never undergone automated perimetry and who were administered the C-20-1 version of the frequency doubling technology. Subjects who returned an abnormal or unreliable test were retested until a normal result was obtained.
Results:
Ninety-seven subjects (96%) returned a normal examination after one test, and 99 (98%) did so after two tests. Two subjects had abnormal initial tests, and two others had unreliable tests. These four subjects required repeat (up to four) testings to return a normal test.
Conclusions:
A small percentage of perimetric novices will demonstrate a learning effect using C-20-1 perimetry, but this mode has high specificity appropriate for glaucoma screening.