The present research explored possibilities for objective visual field measurement devices and schemes and assessed their clinical application. A visual field measurement taken without cognitive patient response was sought. Instruments used were biomicroscopes and transilluminators, Eye-Trac, grain of wheat light board, infrared eye monitoring spectacles connected to a strip chart and audio-output device, and an EOG monitoring system. It was hypothesized that a discrete, involuntary eye movement toward a peripheral light occurred if the light was seen by the subject. No specific eye movement toward the stimulus was ever consistently detected. However, it was noted under certain conditions, identifiable refixation eye movements occurred when the peripheral stimulus was extinguished. Using grain of wheat bulbs, scotomas eight degrees in size or larger could be detected. This procedure could be clinically useful in the evaluation of visual fields in malingerers or other persons unable to be tested with present visual field testing procedures.
Files are restricted to Pacific University. Sign in to view.