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Slant thresholds obtained at eccentricities of 0°, 7.5°, and 15° under monocular and binocular (stereo) viewing conditions. Error bars in this and subsequent figures indicate standard error. The binocular threshold for Subject 4 at 15° of eccentricity was 63.74 ± 35.44°; the Y axis was truncated for readability purposes.
