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Joanne Katz; A Comparison of the Pattern- and Total Deviation–Based Glaucoma Change Probability Programs. Invest. Ophthalmol. Vis. Sci. 2000;41(5):1012-1016.
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purpose. To compare the rates of progression of visual field defects in glaucoma
patients, by using the Glaucoma Change Probability program based on
pattern deviation and total deviation probability maps.
methods. The incidence of progression of visual field loss among 67 eyes of 56
glaucoma patients with an average of 6 years of follow-up was estimated
by applying the criteria set by the Early Manifest Glaucoma Treatment
study, which uses the output from the Glaucoma Change Probability (GCP)
program of the Humphrey Field Analyzer (San Leandro, CA) based on
pattern deviation probability maps. This incidence estimate was
compared with one obtained by applying the same criteria but using the
GCP program based on total deviation probability maps.
results. The 6-year incidence of progression among patients with glaucoma was
23.2% and 35.7% using the GCP program based on pattern deviation and
total deviation probability maps, respectively. Not all patients in
whom visual field loss progressed according to pattern deviation also
showed progression according to total deviation.
conclusions. The GCP program based on pattern deviation probability maps appears to
screen out patients in whom progression of visual field defects may be
due to diffuse loss from cataract, but the pattern deviation maps may
also be identifying other types of field loss not detected by the total
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