Methodological caveats for monitoring binocular eye position with nonius stimuli.
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.
Shimono
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K
Communications Research Center, Ottawa, Canada.
Ono
H
H
Saida
S
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Mapp
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AP
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*