Automatic perimetry (COMPETER). Ability to detect early glaucomatous field defects
A. Heijl, S. M. Drance and G. R. Douglas
The ability of fully automatic computerized perimetry to detect early
glaucomatous field damage was compared with that of careful static and
kinetic manual perimetry in a clinical study on 104 patients, 51 of whom
had early glaucomatous field defects, 20 of whom were glaucoma suspects
with no field defects, and 33 of whom were normal. The automatic perimeter
used was the COMPETER automatic perimeter employing actual threshold
measurements. The interpretation of the automatic fields followed a set of
predetermined criteria. Fifty-one eyes had defects in the manual charts, 48
(94%) of which were detected by automatic perimetry using the central test
point pattern of the perimeter. Two (4%) fields thought to be normal after
manual perimetry were correctly found to be abnormal by the automatic
perimeter, which yielded four (8%) false-positives in the normal fields. By
using a different set of criteria for the interpretation of the automatic
fields, the sensitivity could be increased to 98% of these early defects,
but at the cost of 22% false-positives.
