Automated kinetic perimetry with two peripheral isopters in glaucoma
K. N. Miller, M. B. Shields and A. R. Ollie
Duke University Eye Center, Durham, NC 27710.
An automated perimeter (Fieldmaster 5000) was used to measure the central
30 degrees of vision with static targets (suprathresholding with
quantification of defects) and the peripheral visual field with two kinetic
stimuli in 599 eyes of 362 patients with glaucoma or a suspicion of
glaucoma. The purpose of the study was to compare the additional
information gained by measuring the peripheral visual field with two
isopters against the time required for this extra examination. The
peripheral visual field supported the diagnosis made by central testing in
approximately one fourth of all eyes and added additional diagnostic
information in another quarter of the cases. In 7% of the total population,
or 11% of eyes with abnormal fields, a normal central field was associated
with a glaucomatous peripheral defect. Half of the latter eyes had
corresponding glaucomatous optic disc changes. The more sensitive isopter
uncovered the vast majority of the peripheral field defects. Measurement of
each isopter accounted for 22% of the total testing time.
