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The Effect of Binocular Overlap Mode on Contrast Thresholds Across the Field-of-View as a Function of Spatial and Temporal Frequency.
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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Two partial binocular overlap display modes, the convergent display mode and the divergent display mode, have been proposed as alternatives to the full binocular overlap display mode in helmet-mounted displays. In the full binocular overlap display mode, the entire field-of-view FOV is binocular. The partial overlap display modes increase the FOV by reducing the size of the binocular overlap region and introducing two flanking monocular regions. Visual sensitivity is known to be lower in monocular regions. Another consequence of the partial binocular overlap display mode is a perceptual effect known as luning, which is a subjective darkening in the monocular regions near the binocular overlap border due to dichoptic stimulation. Luning has been shown to be more severe in the divergent display mode compared to the convergent display mode. The purpose of our study was to investigate the effect of these display modes on visual sensitivity across the FOV. It was hypothesized that visual thresholds would be highest in the divergent mode, where luning was most severe, and lowest in the full overlap mode, where there was no dichoptic stimulation. We measured the visual threshold to probe targets across the FOV for 1 the full overlap, 2 the convergent node, and 3 the divergent mode.
APPROVED FOR PUBLIC RELEASE