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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
Binocularity during reading fixations: Properties of the minimum fixation disparity
Stephanie Jainta1, Joerg Hoormann, Wilhelm Bernhard Kloke
1Leibniz Research Centre for Working Environment and Human Factors, Ardeystrasse 67, 44139 Dortmund, Germany. jainta@ifado.de
Vision Research
|June 25, 2010
Summary
This study found that the optimal binocular vision during reading is achieved when fixation disparity is minimized. Fixation position within a sentence significantly impacts this minimum fixation disparity.
Area of Science:
- Vision Science
- Ophthalmology
- Neuroscience
Background:
- The binocular system aims to minimize fixation disparity during visual tasks.
- Minimum fixation disparity is considered an indicator of optimal binocular status.
Purpose of the Study:
- To investigate the dynamics of fixation disparity during reading.
- To determine factors influencing minimum fixation disparity in reading.
- To correlate reading fixation disparity with single-target fixation disparity.
Main Methods:
- Eye movements of 18 participants were recorded using EyeLink II.
- Participants read 60 sentences from the Potsdam-Sentence-Corpus (PSC) at a 60cm viewing distance.
- Fixation disparity was measured during reading and single-target fixation tasks.
Main Results:
- Minimum fixation disparity was often reached post-saccadic drift, influenced by fixation position within the sentence.
- Saccade amplitude had a negligible effect on minimum fixation disparity.
- Fixation position's effect correlated with individual binocular disconjugacy compensation during reading.
Conclusions:
- Fixation disparity during reading is influenced by fixation position and individual compensatory abilities.
- Reading fixation disparity showed correlation with single-target fixation but tended to be more esophoric (eso).
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