Abstract

Visual acuity has been measured in terms of the reciprocal of the angle in minutes subtended by the individual lines in a parallel-line test object at the limit of perception of the lines. Both clear and opaque lines in this test object were of equal width. It was found that the limit of perception of the lines in such a test object depends upon the orientation of the lines. Visual acuity, measured with the lines passing diagonally through the visual field at an angle of 45 degrees to the horizontal, is between 10 and 20 percent lower than that measured with the parallel lines passing vertically or horizontally through the visual field.

© 1948 Optical Society of America

Variation of Visual Acuity with Various Test-Object Orientations and Viewing Conditions*

G. C. Higgins and K. Stultz
J. Opt. Soc. Am. 40(3) 135-137 (1950)

Some Observations and Theory on the Variation of Visual Acuity with the Orientation of the Test Object*

Herschel Leibowitz
J. Opt. Soc. Am. 43(10) 902-905 (1953)

Photographic Granularity and Graininess. IV. Visual Acuity Thresholds; Dynamic versus Static Assumptions*

Loyd A. Jones and George C. Higgins
J. Opt. Soc. Am. 38(4) 398-405 (1948)

The Two-Quanta Hypothesis as a General Explanation for the Behavior of Threshold Values and Visual Acuity for the Several Receptors of the Human Eye

M. A. Bouman and H. A. van der Velden
J. Opt. Soc. Am. 38(7) 570-581 (1948)

The Effect of Pupil Size on Visual Acuity for Photometrically Equated Test Fields at Various Levels of Luminance*

Herschel Leibowitz
J. Opt. Soc. Am. 42(6) 416-422 (1952)