Angle of strabismus and visual function in secondary exotropia

DOI 23 References
  • Kumaki Shun
    Department of Orthoptics, Faculty of Medical Technology, Teikyo University
  • Matsuoka Kumiko
    Department of Orthoptics, Faculty of Medical Technology, Teikyo University
  • Minoda Haruka
    Department of Ophthalmology, Teikyo University School of Medicine

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  • 続発外斜視の斜視角と視機能

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Abstract

Purpose: To study the correlations of the angle of strabismus with age and visual function in adult eyes with sensory strabismus and consecutive strabismus. <BR>Subjects and Methods: Subjects were 260 of 1105 eyes with strabismus that were operated on between August 2003 and May 2010 at the Maruo Eye Clinic. The 260 eyes (ages ranged from 16 to 69 years) included 151 eyes with sensory exotropia and 109 eyes with consecutive exotropia. In the eyes with sensory exotropia, the correlations of the strabismus angle with age, visual acuity, and the cause of strabismus were investigated. In the eyes with consecutive exotropia, the correlations of the strabismus angle with age, visual acuity, simultaneous perception, retinal correspondence, and ocular motility were investigated.<BR>Results: In sensory exotropia, large angle strabismus was more frequently found in those eyes with decimal visual acuity less than 0.1, and its occurrence increased in the patients over 40 years old. No significant relationship was found between the angle and the cause of strabismus. In consecutive exotropia, large angle strabismus was more frequently observed in the patients over 40 years old. Overall, the patients had good visual acuity in both eyes but many of them showed a lack of simultaneous perception and retinal correspondence. In addition, some patients with a history of recession of the medial rectus muscle were seen with adduction disorders, and the patients with severer disorders tended to have larger deviations. <BR>Conclusions: Our results suggested that poor visual acuity could cause large angle strabismus in patients with sensory exotropia and that the angle of deviation tended to increase with age in patients with consecutive exotropia.

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