Several new stereoscope test cards were designed for this study to measure the maximum magnitude of the phenomenal stereofield. The magnitude of the stereofield was then compared to stereoacuity measurements. Using a Brewster stereoscope, 50 volunteer subjects viewed the test cards with each of three different instruction sets. A significant difference was found between two of the instruction sets and the size of the stereofield elicited. No correlation was found between stereoacuity and the perceived limits of the stereofield. Organization of the stereofield cannot be predicted based on geometrical models derived from measuring Panum's area. The effects of temporal and spatial summation and unlimited fixation influence the size of the phenomenal stereofield. Stereoacuity alone cannot be used to predict normal from abnormal stereo-behavior.
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