Erschienen in:
25.04.2016 | Clinical Investigation
Relationship between reading performance and saccadic disconjugacy in patients with convergence insufficiency type intermittent exotropia
verfasst von:
Masakazu Hirota, Hiroyuki Kanda, Takao Endo, Tibor Karl Lohmann, Tomomitsu Miyoshi, Takeshi Morimoto, Takashi Fujikado
Erschienen in:
Japanese Journal of Ophthalmology
|
Ausgabe 4/2016
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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).