Huckauf A, Müsseler J, Fährmann F, 2009, "Visual acuity in x, y, and z" Perception 38 ECVP Abstract Supplement, page 69
Visual acuity in x, y, and z
A Huckauf, J Müsseler, F Fährmann
The more a stimulus is presented in the visual eccentricity, the smaller the probability to recognize it due to decreasing visual acuity. The decline of acuity has been quantified for the horizontal dimension (x-axis), and for the vertical dimension ( y-axis). For depth, that is for the z-axis, however, the decline is still unknown and might be traced back to performance assessment problems. We developed a set-up that allows assessment of performance at various distances in depth. With this set-up we measured letter recognition performance at 3°, 6°, and 9° of eccentricity in all three dimensions: left of fixation (x-direction), above fixation (y-direction), and behind fixation (z-direction). The data replicated the already known effects of eccentricity and of the inferiority of vertical relative to horizontal acuity. Additionally, the worst performances were observed for the z-direction. This inferiority was even stronger for binocular relative to monocular viewing, which can be traced back to double images evolving in binocular vision. As expected, further results show that performances for virtual depth are much better than in real depth. Implications for stereoscopic viewing as well as for models of visual perception are discussed.
These web-based abstracts are provided for ease of seaching and access, but certain aspects (such as as mathematics) may not appear in their optimum form. For the final published version of this abstract, please see
ECVP 2009 Abstract Supplement (complete) size: 2236 Kb
[Publisher's note: The abstracts in this year's ECVP supplement have been published with virtually no copy editing by Pion, thus the standards of grammar and style may not match those of regular Perception articles.]