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  • Title: Methodological caveats for monitoring binocular eye position with nonius stimuli.
    Author: Shimono K, Ono H, Saida S, Mapp AP.
    Journal: Vision Res; 1998 Feb; 38(4):591-600. PubMed ID: 9536381.
    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.
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