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01-07-2016 | Clinical Investigation

Relationship between reading performance and saccadic disconjugacy in patients with convergence insufficiency type intermittent exotropia

Authors: Masakazu Hirota, Hiroyuki Kanda, Takao Endo, Tibor Karl Lohmann, Tomomitsu Miyoshi, Takeshi Morimoto, Takashi Fujikado

Published in: Japanese Journal of Ophthalmology | Issue 4/2016

Abstract

Purpose

To determine the relationship between re-reading the same line and saccadic disconjugacy in patients with convergence insufficiency-type intermittent exotropia [CI-type X(T)].

Methods

Eight patients with CI-type X(T) and ten healthy orthophoric individuals were studied. Video-oculography was used to assess the eye movements during the reading of a Japanese novel displayed on a 23-in. liquid crystal monitor placed 60 cm from the eyes. The sentences were displayed horizontally and read from left to right. The number of unintentional re-readings of the same line was counted, and the disconjugacy at the median of the saccade between the end of a line and the next line was determined.

Results

The number of re-readings of the same line in patients with CI-type X(T) was 4.9 ± 2.3 times which was significantly higher than that in the controls at 0.2 ± 0.4 times (P < 0.001). The saccadic disconjugacy was significantly larger in patients with CI-type X(T) at −1.70° ± 0.72° than that in the controls at −0.40°± 0.30° (P < 0.001). The number of re-readings of the same line was significantly and positively correlated with the saccadic disconjugacy (R = 0.84, R ² = 0.71, P < 0.01).

Conclusions

The results of our study indicate that saccadic disconjugacy is associated with re-reading the same line in patients with CI-type X(T).

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Title: Relationship between reading performance and saccadic disconjugacy in patients with convergence insufficiency type intermittent exotropia
Authors: Masakazu Hirota
Hiroyuki Kanda
Takao Endo
Tibor Karl Lohmann
Tomomitsu Miyoshi
Takeshi Morimoto
Takashi Fujikado
Publication date: 01-07-2016
Publisher: Springer Japan
Published in: Japanese Journal of Ophthalmology / Issue 4/2016
Print ISSN: 0021-5155
Electronic ISSN: 1613-2246
DOI: https://doi.org/10.1007/s10384-016-0444-2

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Relationship between reading performance and saccadic disconjugacy in patients with convergence insufficiency type intermittent exotropia

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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