High spatial resolution automated perimetry in glaucoma
a Department of Visual
Science, Institute of Ophthalmology, London, b Glaucoma Unit, Moorfields
Eye Hospital, City Road, London
Correspondence to: F W Fitzke, Department of Visual Science, Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL.
Accepted for publication 12 February 1997
BACKGROUND
Automated perimetry is of fundamental
importance in assessing visual function in glaucoma. A technique was
evaluated to perform high spatial resolution automated perimetry to
allow a more detailed assessment of the luminance sensitivity in
selected regions of the visual field than is possible with conventional perimetry.
METHODHigh spatial resolution perimetry was
performed using a Humphrey automated perimeter by measuring luminance
sensitivity across a 9 by 9 degree custom grid of 100 test locations
with a separation between adjacent locations of 1 degree. Quantitative
analysis of the raw and Gaussian filtered thresholds was performed to
assess the repeatability of the technique in normals, glaucoma
suspects, and glaucoma patients.
RESULTSThe testing protocol was well tolerated by
all subjects. High spatial resolution perimetry in glaucomatous eyes
demonstrated fine luminance sensitivity loss not suspected with
conventional perimetry. High spatial resolution perimetry also
demonstrated reproducible areas of sensitivity loss in some
glaucomatous eyes in areas of the visual field which appear normal with
conventional programmes. The repeatability of the technique correlated
with mean threshold sensitivity and was substantially improved to
clinically acceptable levels by Gaussian filtering the thresholds.
CONCLUSIONThis technique of high spatial
resolution perimetry allows the practical assessment of selected
regions of the visual field at higher resolution than conventional
perimetry, and may be clinically useful in glaucoma.
© 1997 by British Journal of Ophthalmology
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