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Objective evaluation of visual fatigue in patients with intermittent exotropia

PURPOSE: The purpose of this study was to evaluate the degree of visual fatigue in patients with intermittent exotropia (IXT) using the binocular fusion maintenance (BFM) test. METHODS: Fourteen patients with IXT (32.1 ± 16.4 years) and 15 age-matched healthy volunteers (31.2 ± 9.3 years) participat...

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Autores principales: Hirota, Masakazu, Yada, Kozue, Morimoto, Takeshi, Endo, Takao, Miyoshi, Tomomitsu, Miyagawa, Suguru, Hirohara, Yoko, Yamaguchi, Tatsuo, Saika, Makoto, Fujikado, Takashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098610/
https://www.ncbi.nlm.nih.gov/pubmed/32214343
http://dx.doi.org/10.1371/journal.pone.0230788
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author Hirota, Masakazu
Yada, Kozue
Morimoto, Takeshi
Endo, Takao
Miyoshi, Tomomitsu
Miyagawa, Suguru
Hirohara, Yoko
Yamaguchi, Tatsuo
Saika, Makoto
Fujikado, Takashi
author_facet Hirota, Masakazu
Yada, Kozue
Morimoto, Takeshi
Endo, Takao
Miyoshi, Tomomitsu
Miyagawa, Suguru
Hirohara, Yoko
Yamaguchi, Tatsuo
Saika, Makoto
Fujikado, Takashi
author_sort Hirota, Masakazu
collection PubMed
description PURPOSE: The purpose of this study was to evaluate the degree of visual fatigue in patients with intermittent exotropia (IXT) using the binocular fusion maintenance (BFM) test. METHODS: Fourteen patients with IXT (32.1 ± 16.4 years) and 15 age-matched healthy volunteers (31.2 ± 9.3 years) participated in the study. BFM was assessed by measuring the transmittance of liquid crystals placed in front of the subject's nondominant eye at the instance when binocular fusion was broken and vergence eye movement was induced. A questionnaire on subjective symptoms was administered to the subjects before and after the visual task. The visual task consisted of a reciprocal movement between 67 and 40 cm. RESULTS: The change [post–pre] of BFM was significantly lower in the IXT group (−0.185 ± 0.187) than in the control group (−0.030 ± 0.070) (P = 0.010). The change of total subjective eye symptom score was significantly greater in the IXT group (2.28 ± 1.43) than in the control group (0.93 ± 1.27) (P = 0.018). The reduction in BFM rate with increasing total subjective eye symptom score was significantly greater in the IXT group (−0.106 ± 0.017) than in the control group (−0.030 ± 0.013) (P = 0.006). CONCLUSION: The present findings objectively showed that patients with IXT are at a greater risk of visual fatigue in comparison with healthy individuals.
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spelling pubmed-70986102020-04-03 Objective evaluation of visual fatigue in patients with intermittent exotropia Hirota, Masakazu Yada, Kozue Morimoto, Takeshi Endo, Takao Miyoshi, Tomomitsu Miyagawa, Suguru Hirohara, Yoko Yamaguchi, Tatsuo Saika, Makoto Fujikado, Takashi PLoS One Research Article PURPOSE: The purpose of this study was to evaluate the degree of visual fatigue in patients with intermittent exotropia (IXT) using the binocular fusion maintenance (BFM) test. METHODS: Fourteen patients with IXT (32.1 ± 16.4 years) and 15 age-matched healthy volunteers (31.2 ± 9.3 years) participated in the study. BFM was assessed by measuring the transmittance of liquid crystals placed in front of the subject's nondominant eye at the instance when binocular fusion was broken and vergence eye movement was induced. A questionnaire on subjective symptoms was administered to the subjects before and after the visual task. The visual task consisted of a reciprocal movement between 67 and 40 cm. RESULTS: The change [post–pre] of BFM was significantly lower in the IXT group (−0.185 ± 0.187) than in the control group (−0.030 ± 0.070) (P = 0.010). The change of total subjective eye symptom score was significantly greater in the IXT group (2.28 ± 1.43) than in the control group (0.93 ± 1.27) (P = 0.018). The reduction in BFM rate with increasing total subjective eye symptom score was significantly greater in the IXT group (−0.106 ± 0.017) than in the control group (−0.030 ± 0.013) (P = 0.006). CONCLUSION: The present findings objectively showed that patients with IXT are at a greater risk of visual fatigue in comparison with healthy individuals. Public Library of Science 2020-03-26 /pmc/articles/PMC7098610/ /pubmed/32214343 http://dx.doi.org/10.1371/journal.pone.0230788 Text en © 2020 Hirota et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Hirota, Masakazu
Yada, Kozue
Morimoto, Takeshi
Endo, Takao
Miyoshi, Tomomitsu
Miyagawa, Suguru
Hirohara, Yoko
Yamaguchi, Tatsuo
Saika, Makoto
Fujikado, Takashi
Objective evaluation of visual fatigue in patients with intermittent exotropia
title Objective evaluation of visual fatigue in patients with intermittent exotropia
title_full Objective evaluation of visual fatigue in patients with intermittent exotropia
title_fullStr Objective evaluation of visual fatigue in patients with intermittent exotropia
title_full_unstemmed Objective evaluation of visual fatigue in patients with intermittent exotropia
title_short Objective evaluation of visual fatigue in patients with intermittent exotropia
title_sort objective evaluation of visual fatigue in patients with intermittent exotropia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098610/
https://www.ncbi.nlm.nih.gov/pubmed/32214343
http://dx.doi.org/10.1371/journal.pone.0230788
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