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Changes in angle of optic nerve and angle of ocular orbit with increasing age in Japanese children
  1. Hideyuki Tsukitome1,
  2. Yoshikazu Hatsukawa2,
  3. Tomoko Morimitsu2,
  4. Teiji Yagasaki3,
  5. Mineo Kondo1
  1. 1Department of Ophthalmology, Mie University Graduate School of Medicine, Tsu, Japan
  2. 2Department of Ophthalmology, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan
  3. 3Yagasaki Eye Clinic, Ichinomiya, Japan
  1. Correspondence to Dr Mineo Kondo, Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan; mineo{at}clin.medic.mie-u.ac.jp

Abstract

Purpose To study changes in the opening angle of the optic nerve and the angle of the ocular orbit with increasing age in normal Japanese children.

Methods We studied 147 normal children (aged 6 months to 18 years) who had undergone CT as a diagnostic procedure. Measurements were performed on axial CT images that included the entire optic nerve of both eyes. The opening angle of the optic nerve was defined as the angle formed by the intersection of a line running through the left optic nerve and a vertical line passing through the centre of the nose. The opening angle of the orbit was defined as the angle formed by the intersection of a line running tangentially along the deep lateral wall of the left orbit and a vertical line passing through the centre of the nose. The relationship between age and these opening angles was analysed by regression analysis.

Results The correlation between age and opening angle of the optic nerve was not significant. In contrast, the opening angle of the orbit decreased relatively rapidly until about 2–3 years of age, and then it stabilised. The decrease in the opening angle of the orbit with increasing age was significant (p<0.001). The relationship between these two parameters was best fitted by a logarithmic regression curve.

Conclusions Because the opening angle of the orbit decreased significantly with increasing age, this factor must be considered when diagnosing and treating strabismus in children.

  • Anatomy
  • Orbit
  • Optic Nerve

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