Purpose: The prevalence of glaucomatous visual fields (GVFs) for
Short-Wavelength Automated Perimetry (SWAP) in patients with ocular
hypertension (OH) ranges between 11.8% and 43% across studies in which
different definitions of GVF were used. We assessed the prevalence using
various definitions in one large OH population.
Methods: Humphrey Field Analyzer (HFA) SWAP 24-2 Full Threshold tests
were performed on 682 eyes of 342 patients with an intra-ocular pressure
between 22 and 32 mmHg and reproducibly normal Achromatic Automated Perimetry.
The normative databases of the HFA and of C.A. Johnson and colleagues were used
to compute the parameters. A GVF was defined as either 1) a Glaucoma Hemifield
Test Outside Normal Limits and/or a Pattern Standard Deviation below the 5th
percentile, or 2) >=1 clusters of >=3 points below the 5th percentile of
which one point is below the 1st percentile on the Pattern Deviation
probability plot, or 3) a Mean Deviation below the 5th percentile.
Results: The prevalence was, with the HFA’s and Johnson’s normative
data, 3.5% and 9.4% for the 1st definition, 11.0% and 17.0% for the 2nd
definition, and 3.5% and 12.5% for the 3rd definition, respectively.
Conclusion: The prevalence of GVFs in OH ranges from 3.5% to 17.0%,
depending on the used definition. Johnson’s normative database yields more
abnormal tests than the standard HFA’s.
Acknowledgment: C.A. Johnson and colleagues kindly provided us with
their normative data.
Proprietary interest: none.