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- Title
Relationship between reading performance and saccadic disconjugacy in patients with convergence insufficiency type intermittent exotropia.
- Authors
Hirota, Masakazu; Kanda, Hiroyuki; Endo, Takao; Lohmann, Tibor; Miyoshi, Tomomitsu; Morimoto, Takeshi; Fujikado, Takashi
- 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 = 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).
- Subjects
EXOTROPIA; SACCADIC eye movements; STRABISMUS; BINOCULAR vision disorders; EYE movement disorders
- Publication
Japanese Journal of Ophthalmology, 2016, Vol 60, Issue 4, p326
- ISSN
0021-5155
- Publication type
Article
- DOI
10.1007/s10384-016-0444-2