Abstract

Decentration of stereoimages crossed makes a figure appear nearer and smaller; uncrossed makes it look larger and more remote. Quantification of these effects is presented with an orthogonal equation describing the interactions of distance from the observer, magnitudes of the decentrations crossed and uncrossed, and phenomenal judgment of apparent size. A 30- × 30-cm white square was photographed in orthostereo at distances of 3, 6, 12, 24, 48, and 96 m. Decentrations of 0 to 60 mm of the projected images in 10-mm steps were made and matched with an adjacent variable square. Some comment is made concerning the theoretical and practical bearings of the results.

© 1958 Optical Society of America

Relationship between Stimulus Size and Threshold Intensity in the Fovea Measured at Four Exposure Times

Beverly M. Hillmann
J. Opt. Soc. Am. 48(6) 422-428 (1958)

Luminosity Functions for Various Field Sizes and Levels of Retinal Illuminance

R. E. Bedford and G. W. Wyszecki
J. Opt. Soc. Am. 48(6) 406-411 (1958)

Some Visual Functions of a Unilaterally Color-Blind Person. I. Critical Fusion Frequency in Various Spectral Regions*

Eda Berger, C. H. Graham, and Yun Hsia
J. Opt. Soc. Am. 48(9) 614-622 (1958)

Some Visual Functions of a Unilaterally Color-Blind Person. II. Binocular Brightness Matches in Various Spectral Regions*

Eda Berger, C. H. Graham, and Yun Hsia
J. Opt. Soc. Am. 48(9) 622-627 (1958)

Effect of Convergence on the Infrared Spectra of Anisotropic Substances

Darwin L. Wood and Shashanka S. Mitra
J. Opt. Soc. Am. 48(8) 537-542 (1958)