![]() ![]() In another experiment, we used a novel paradigm that allowed the presentation of real binocular disparity stimuli in the presence of rich environmental cues to distance but not interstimulus depth. Furthermore, binocular vision can significantly improve both the accuracy and precision of depth estimation to at least 18 m. We confirm that stereopsis supports reliable depth discriminations beyond typical laboratory distances. Regression-based precision measures were much more precise for binocular compared to monocular conditions (ratios between 2.1 and 48). Binocular depth estimates were much nearer to veridical although also compressed. Under monocular conditions, perceived depth was significantly compressed. In the first set of experiments, we compared monocular and binocular performance on depth interval estimation and discrimination tasks at 4.5, 9.0 or 18.0 m. The benefits of binocular vision have been debated throughout the history of vision science yet few studies have considered its contribution beyond a viewing distance of a few meters. ![]()
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