Objective vs subjective measures of fixation disparity for short and long fixation periods

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
Wolfgang JaschinskiWilhelm Bernhard Kloke

Abstract

Fixation disparity, i.e. the vergence error for stationary fusion stimuli, can be measured objectively with eye trackers and subjectively with nonius lines. Between these two measures, previous studies found differences that tended to be proportional to the amount of forced vergence, i.e. the discrepancy between vergence and accommodative stimulus. We investigate whether objective and subjective fixation disparity might be similar without forced vergence. We simultaneously measured fixation disparity with the EyeLink II system and with flashed dichoptic nonius lines in 17 subjects who observed targets at a vergence stimulus of 6 deg in an haploscope with 60 cm viewing distance. We found individual differences in objective fixation disparity in a range of about 20 (eso) to -60 (exo) min arc which was considerably larger than the range of subjective fixation disparity. Results were similar for long fixation periods (about 15 s) and short fixation periods (about 1.5 s) between 5 deg saccadic gaze shifts. Further, objective fixation disparity was correlated with objective heterophoria, i.e. the vergence state without a fusion stimulus (r = 0.8, p < 0.001). Subjective fixation disparity explained only about 25% of the inter-individu...Continue Reading

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Citations

Dec 17, 2010·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Ignacio Serrano-PedrazaJenny C A Read
Jul 15, 2015·Strabismus·Guntram KommerellMichael Bach
Jun 14, 2012·Current Eye Research·Eun H Kim, Tara L Alvarez
Jun 25, 2010·Vision Research·Stephanie JaintaWolfgang Jaschinski
Oct 3, 2015·PloS One·Volkhard SchrothWolfgang Jaschinski
Nov 2, 2018·PloS One·Clara MestreJaume Pujol

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