June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Influence of textured backgrounds on fusional vergence: preliminary results using an eye tracker
Author Affiliations & Notes
  • Cecilia Benedetti
    DIMES, Ophthalmology Service, Bologna, Italy
  • Emanuela Marcelli
    DIMES, Laboratory of Bioengineering, Bologna, Italy
  • Michela Fresina
    DIMES, Ophthalmology Service, Bologna, Italy
  • Emilio C Campos
    DIMES, Ophthalmology Service, Bologna, Italy
  • Barbara Bortolani
    DIMES, Laboratory of Bioengineering, Bologna, Italy
  • Guido Tiberi
    DIMES, Laboratory of Bioengineering, Bologna, Italy
  • Piera Versura
    DIMES, Ophthalmology Service, Bologna, Italy
  • Laura Cercenelli
    DIMES, Laboratory of Bioengineering, Bologna, Italy
  • Footnotes
    Commercial Relationships Cecilia Benedetti, None; Emanuela Marcelli, None; Michela Fresina, None; Emilio Campos, None; Barbara Bortolani, None; Guido Tiberi, None; Piera Versura, None; Laura Cercenelli, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 2918. doi:
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      Cecilia Benedetti, Emanuela Marcelli, Michela Fresina, Emilio C Campos, Barbara Bortolani, Guido Tiberi, Piera Versura, Laura Cercenelli; Influence of textured backgrounds on fusional vergence: preliminary results using an eye tracker. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):2918.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract 
 
Purpose
 

The vergences ensure and maintain binocular fixation and binocular vision. The amplitude of vergences depends on many factors, one of which is the amount of fusible material on the binocular field of vision. In casual seeing the whole surface of the two retinas is exposed to similar stimuli and the conditions for motor fusion should be optimal. The retinal periphery is a powerful factor in production of fusional movements and makes an important contribution to stabilization of relative position of the eyes.<br /> The purpose of the study was to evaluate whether the presence of a textured background in the visual stimulus may influence the convergence fusional response.

 
Methods
 

Eleven subjects with normal binocular vision underwent fusional disparity stimuli: a base-out prism of 6 diopters was placed in front of the right eye to elicit disparity. Eye movements were continuously recorded using the Viewpoint infrared video eye tracker (Arrington Research, Scottsdale, AZ, USA) and a custom software was developed to automatically analyze off-line the saccadic response (gaze angle). Each subject was examined twice, once by presenting the visual stimulus (black dot) on a white background, then by presenting the same stimulus on a textured background (Figure 1). The order of presentation of the two tests was randomly chosen.

 
Results
 

Eye tracking recordings showed a typical pattern for the fusional behavior: a preliminary saccadic movement of both eyes (version phase) and a following convergence movement with the eyes moving towards each other to achieve single vision (vergence phase) (Figure 2.a).<br /> When presenting the stimulus on the white background only 6 subjects (54%) achieved fusional convergence. This number increased up to 9 subjects (82%) when presenting the same stimulus on the textured background (Figure 2.b).

 
Conclusions
 

The fusional vergence response can be accurately studied and evaluated using an eye tracker. In subjects with normal binocular vision the presence of a textured background seems to facilitate the fusional convergence ability.  

 

 
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