A confrontation test of visual fields in the low-vision patient

We report a simple method for measuring the extent of the visual field in patients from whom this measurement is difficult. One Maddox rod is used before the eye under test. Through the Maddox rod lens, this eye sees a white streak produced by a penlight. While fixating this white streak another penlight is brought into the field of view from the periphery. The patient is required to report only whether he sees one or two light streaks. The results correlate well with field measurements made on the tangent screen in patients with simulated field losses.