June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Objective Assessment of Visual Fatigue by Ability to Maintain Binocular Fusion
Author Affiliations & Notes
  • Masakazu Hirota
    Applied Visual Science, Osaka University Graduate School of Medicine, Suita-shi, Japan
  • Takeshi Morimoto
    Applied Visual Science, Osaka University Graduate School of Medicine, Suita-shi, Japan
  • Hiroyuki Kanda
    Applied Visual Science, Osaka University Graduate School of Medicine, Suita-shi, Japan
  • Takao Endo
    Ophthalmology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
  • Tomomitsu Miyoshi
    Integrative Physiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
  • Suguru Miyagawa
    Applied Visual Science, Osaka University Graduate School of Medicine, Suita-shi, Japan
    Topcon corporation, Itabashi, Tokyo, Japan
  • Yoko Hirohara
    Topcon corporation, Itabashi, Tokyo, Japan
  • Tatsuo Yamaguchi
    Topcon corporation, Itabashi, Tokyo, Japan
  • Makoto Saika
    Topcon corporation, Itabashi, Tokyo, Japan
  • Takashi Fujikado
    Applied Visual Science, Osaka University Graduate School of Medicine, Suita-shi, Japan
  • Footnotes
    Commercial Relationships   Masakazu Hirota, 2016-05553 (P); Takeshi Morimoto, None; Hiroyuki Kanda, None; Takao Endo, None; Tomomitsu Miyoshi, None; Suguru Miyagawa, 2016-05553 (P), Topcon (E); Yoko Hirohara, Topcon (E); Tatsuo Yamaguchi, 2016-05553 (P), Topcon (E); Makoto Saika, 2016-05553 (P), Topcon (E); Takashi Fujikado, 2016-05553 (P)
  • Footnotes
    Support  KAKENHI (25293354).
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 5410. doi:
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      Masakazu Hirota, Takeshi Morimoto, Hiroyuki Kanda, Takao Endo, Tomomitsu Miyoshi, Suguru Miyagawa, Yoko Hirohara, Tatsuo Yamaguchi, Makoto Saika, Takashi Fujikado; Objective Assessment of Visual Fatigue by Ability to Maintain Binocular Fusion. Invest. Ophthalmol. Vis. Sci. 2017;58(8):5410.

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

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Abstract

Purpose : Visual fatigue is becoming a more prevalent health problem with the circulation of tablet-type computers and smart phones. However, objective measures to diagnose visual fatigue are not well established. Patients with intermittent exotropia occasionally complain of diplopia after work requiring prolonged eye strain, which suggests a break of binocular fusion occurs by visual fatigue due to near work. We developed a binocular wavefront sensor equipped with a liquid crystal shutter in which the intensity of the incoming light was linearly reduced and can evaluate the ability of binocular fusion maintenance (BFM). The present study aimed to investigate whether the ability of BFM could be a measure of visual fatigue after visual tasks.

Methods : Forty healthy volunteers (38.2 ± 12.9 years; mean ±SD) participated in the study. The ability of BFM was assessed by measuring the transmittance of liquid crystals placed in front of the subjects’ non-dominant eye when binocular fusion was broken and vergence eye movement was induced. A questionnaire on subjective symptoms was given to the subjects before and after a visual task of 30 min.

Results : The ability of BFM was significantly decreased after the visual task (pre-visual task score: 0.920 ± 0.063; post-visual task score: 0.789 ± 0.105; P<0.001) and was negatively correlated with the total subjective eye symptom score (R2=0.752, P<0.001). In addition, the ability of BFM was independent of subjects’ age (R2 =0.053, P =0.09).

Conclusions : The ability of BFM can be used as an objective and quantitative indicator of visual fatigue not only for young subjects but also for subjects with presbyopic age.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

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