Oculokinetic perimetry (OKP) has been proposed as a method to screen f
or glaucomatous visual field defects but its use is limited by a high
false positive rate. The standard hand-held screening OKP chart uses 2
6 points. The spiral arrangement of numbers with this chart allows loc
i to be tested close to fixation but may contribute to the high false
positive rate. We have therefore designed and assessed a simplified OK
P chart with 22 numbers arranged circumferentially around a central ta
rget. The positions of the numbers are such that points between 12-deg
rees and 16-degrees from fixation are tested in all quadrants. Loci cl
oser to fixation are not tested. Fifty eyes from 50 patients with glau
coma and 50 eyes from 50 patients with normal fields were tested with
both charts. Of the patients with glaucoma 88% gave a positive result
with the 26-point chart and 90% gave a positive result with the 22-poi
nt chart. The false positive rate of OKP in patients without field los
s was 12% with the 26-point chart and 0 with the 22-point chart (0.02>
p>0.01). We therefore propose a modification of the existing OKP chart
which reduces the false positive rate in glaucoma detection.