PMID: 16317376Dec 1, 2005Paper

Horizontal fixation disparity measures with nonius lines

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Wolfgang JaschinskiJulia Buchholz

Abstract

It has been reported that changes in visual direction and retinal correspondence may limit the validity of nonius lines as a subjective measure of vergence, at least in particular viewing conditions, e.g., dynamic or forced vergence. Nonius lines may be valid at larger spatial separation between fusion contour and nonius lines. Therefore, we measured fixation disparity varying the amount of a vertical gap between nonius lines. A static central fusion stimulus was given at a 100-cm viewing distance. The nonius lines were presented with various vertical gaps either continuously (and adjusted to subjective alignment) or flashed in a series of trials (in adaptive testing). Twelve subjects with normal binocular vision were tested repeatedly to identify individual vergence characteristics. When the vertical gap between nonius lines was increased up to 7.9 deg, the amount of subjective fixation disparity tended to increase in part of the subjects, predominantly in those with an exo fixation disparity. Most subjective fixation disparity measures were correlated with each other and with tonic vergence (i.e., dark vergence tested subjectively without fusion stimulus); however, flashed nonius lines at larger nonius gaps were an exception....Continue Reading

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Citations

Feb 3, 2009·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Avesh RaghunandanJames J Saladin
Jan 24, 2007·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Wolfgang JaschinskiNina Walper
Mar 15, 2006·Vision Research·Wolfgang JaschinskiMichael Schürer
Oct 3, 2015·PloS One·Volkhard SchrothWolfgang Jaschinski
May 25, 2013·Perception·Deepika Sridhar, Harold E Bedell
Oct 1, 2013·Ergonomics·Marina MeinertWolfgang Jaschinski

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