Binocular coordination and reading performance during smartphone reading in intermittent exotropia

Masakazu Hirota,1 Hiroyuki Kanda,1 Takao Endo,2 Takeshi Morimoto,1 Tomomitsu Miyoshi,3 Takashi Fujikado1 1Department of Applied Visual Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; 2Department of Ophthalmology, Osaka University Graduate School of Medicine, Izumi, Osaka...

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Main Authors: Hirota M, Kanda H, Endo T, Morimoto T, Miyoshi T, Fujikado T
Format: Article
Language:English
Published: Dove Medical Press 2018-10-01
Series:Clinical Ophthalmology
Subjects:
Online Access:https://www.dovepress.com/binocular-coordination-and-reading-performance-during-smartphone-readi-peer-reviewed-article-OPTH
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author Hirota M
Kanda H
Endo T
Morimoto T
Miyoshi T
Fujikado T
author_facet Hirota M
Kanda H
Endo T
Morimoto T
Miyoshi T
Fujikado T
author_sort Hirota M
collection DOAJ
description Masakazu Hirota,1 Hiroyuki Kanda,1 Takao Endo,2 Takeshi Morimoto,1 Tomomitsu Miyoshi,3 Takashi Fujikado1 1Department of Applied Visual Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; 2Department of Ophthalmology, Osaka University Graduate School of Medicine, Izumi, Osaka, Japan; 3Department of Integrative Physiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan Purpose: This study aimed to evaluate binocular coordination using video-oculography during smartphone reading in patients with intermittent exotropia compared to individuals with normal vision. Patients and methods: Eleven youth and adult patients with intermittent exotropia (21.9±9.3 years) and 15 control subjects (26.6±4.3 years) were examined. Eye movements were recorded during smartphone reading at 50, 30, and 20 cm using video-oculography. The loss of binocular coordination was tentatively defined as a horizontal disparity greater than 2°. The proportion of monocular viewing was the percentage of time for which binocularity was lost during smartphone reading. The proportion of monocular viewing, the reading speed, and the correlation between proportion of monocular viewing and reading speed were analyzed. Results: The proportion of monocular viewing during smartphone reading was significantly higher in the intermittent exotropia group than in the control group (P<0.001). It was significantly more frequent at 20 cm than at 50 cm in the intermittent exotropia group (P<0.05). The reading speed was significantly negatively correlated with the proportion of monocular viewing at 30 and 20 cm in the intermittent exotropia group (P<0.05). Conclusion: A significant increase in the proportion of monocular viewing in the intermittent exotropia group suggests that an appropriate viewing distance should be advised so that users can maintain binocular coordination when viewing a smartphone. Keywords: eye movement, smartphone reading, video-oculography, intermittent exotropia
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spelling doaj.art-dc3734e9e90e4985a28e987c0afbe7512022-12-21T19:31:28ZengDove Medical PressClinical Ophthalmology1177-54832018-10-01Volume 122069207841498Binocular coordination and reading performance during smartphone reading in intermittent exotropiaHirota MKanda HEndo TMorimoto TMiyoshi TFujikado TMasakazu Hirota,1 Hiroyuki Kanda,1 Takao Endo,2 Takeshi Morimoto,1 Tomomitsu Miyoshi,3 Takashi Fujikado1 1Department of Applied Visual Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; 2Department of Ophthalmology, Osaka University Graduate School of Medicine, Izumi, Osaka, Japan; 3Department of Integrative Physiology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan Purpose: This study aimed to evaluate binocular coordination using video-oculography during smartphone reading in patients with intermittent exotropia compared to individuals with normal vision. Patients and methods: Eleven youth and adult patients with intermittent exotropia (21.9±9.3 years) and 15 control subjects (26.6±4.3 years) were examined. Eye movements were recorded during smartphone reading at 50, 30, and 20 cm using video-oculography. The loss of binocular coordination was tentatively defined as a horizontal disparity greater than 2°. The proportion of monocular viewing was the percentage of time for which binocularity was lost during smartphone reading. The proportion of monocular viewing, the reading speed, and the correlation between proportion of monocular viewing and reading speed were analyzed. Results: The proportion of monocular viewing during smartphone reading was significantly higher in the intermittent exotropia group than in the control group (P<0.001). It was significantly more frequent at 20 cm than at 50 cm in the intermittent exotropia group (P<0.05). The reading speed was significantly negatively correlated with the proportion of monocular viewing at 30 and 20 cm in the intermittent exotropia group (P<0.05). Conclusion: A significant increase in the proportion of monocular viewing in the intermittent exotropia group suggests that an appropriate viewing distance should be advised so that users can maintain binocular coordination when viewing a smartphone. Keywords: eye movement, smartphone reading, video-oculography, intermittent exotropiahttps://www.dovepress.com/binocular-coordination-and-reading-performance-during-smartphone-readi-peer-reviewed-article-OPTHEye movementsmartphone readingvideo-oculographyintermittent exotropia
spellingShingle Hirota M
Kanda H
Endo T
Morimoto T
Miyoshi T
Fujikado T
Binocular coordination and reading performance during smartphone reading in intermittent exotropia
Clinical Ophthalmology
Eye movement
smartphone reading
video-oculography
intermittent exotropia
title Binocular coordination and reading performance during smartphone reading in intermittent exotropia
title_full Binocular coordination and reading performance during smartphone reading in intermittent exotropia
title_fullStr Binocular coordination and reading performance during smartphone reading in intermittent exotropia
title_full_unstemmed Binocular coordination and reading performance during smartphone reading in intermittent exotropia
title_short Binocular coordination and reading performance during smartphone reading in intermittent exotropia
title_sort binocular coordination and reading performance during smartphone reading in intermittent exotropia
topic Eye movement
smartphone reading
video-oculography
intermittent exotropia
url https://www.dovepress.com/binocular-coordination-and-reading-performance-during-smartphone-readi-peer-reviewed-article-OPTH
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AT endot binocularcoordinationandreadingperformanceduringsmartphonereadinginintermittentexotropia
AT morimotot binocularcoordinationandreadingperformanceduringsmartphonereadinginintermittentexotropia
AT miyoshit binocularcoordinationandreadingperformanceduringsmartphonereadinginintermittentexotropia
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