title: Methodological caveats for monitoring binocular eye position with nonius stimuli.
abstract: Three experiments, using two sets of Nonius lines placed in a random-dot stereogram, indicated that Nonius alignment does not always reflect binocular eye position and, thus, a caveat is necessary when Nonius alignment is used to monitor binocular eye position. We found that: (a) two Nonius lines with visual line values that differed by up to 7.6 min of arc can appear aligned; (b) the two lines of each of the two Nonius sets continued to appear aligned despite a change in vergence angle of 5.9 min of arc; and (c) the Nonius alignment reflected eye position better, when the binocular dots near the Nonius lines were eliminated.
authors.affiliation: Communications Research Center, Ottawa, Canada.
authors.forename: K
authors.initials: K
authors.lastname: Shimono
authors.forename: H
authors.initials: H
authors.lastname: Ono
authors.forename: S
authors.initials: S
authors.lastname: Saida
authors.forename: A P
authors.initials: AP
authors.lastname: Mapp
mesh_terms: D000328:Adult; D003290:Convergence, Ocular; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D010364:Pattern Recognition, Visual / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology*