[Objective visual field measurement using "pupil perimetry"]

In an attempt to measure the visual field objectively, we developed a system of "Pupil Perimetry". An infrared pupillometry machine was linked to a Goldmann perimeter to record the visual field by mapping the change in the pupil area (mm2) at each target location within the field. We decreased the background intensity to 10Asb to get maximum pupil response. The target was exposed for 0.25 seconds with an intensity of 1,000 Asb. Pupil response was observed up to 90 degrees laterally and 60 degrees nasally across a meridian in normal subjects. Visual fields obtained from patients with homonymous hemianopsia, glaucoma and Leber's optic neuropathy were compatible with a field obtained by a Humphrey field analyzer (FHA) 30-2 program. Pupil perimetry is a useful tool for measuring the visual field objectively.