cyclorotation

Noun

cyclorotation (plural cyclorotations)

1. Torsional movement of the eye (rotational movement that does not shift the centre of the pupil).
   • In measuring eye position, for instance, both Fick and Wundt had adopted procedures which did not treat the co-ordinate frame of the primary position as fundamental. Rather, they related cyclorotations to the visual plane—which is variable—instead of to the horizontal in the primary position.1993, Timothy Lenoir, Hermann Von Helmholtz and the Foundations of Nineteenth-Century Science, University of California Press, page 151
   • The images of horizontal lines in the upper visual field acquire a gradient of cyclorotation with one sign, and those in the lower visual field acquire a gradient of cyclorotation with the opposite sign, as shown in Figure 7.8b.1995, Ian P. Howard, Brian J. Rogers, Binocular Vision and Stereopsis, Oxford University Press, page 269