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Developmental change of the biorbital angle in normal Japanese infants

Teiji Yagasaki1,2, Yoshimi Yokoyama2, Makiko Tsukui2

  • 1Yagasaki Eye Clinic, Ichinomiya, Aichi, Japan, y-teiji@jb3.so-net.ne.jp.

Clinical Ophthalmology (Auckland, N.Z.)
|October 24, 2018
PubMed

Insights

The biorbital angle, the angle between the lateral orbital walls, is significantly larger in infants under one year old compared to older children. This wider angle may explain newborn exotropia, which typically resolves by 4 months.

Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Craniofacial Development

Background:

  • The biorbital angle, defined as the opening angle between both lateral walls of the orbit, is a key anatomical measurement.
  • Understanding its changes during postnatal development is crucial for pediatric eye health.

Purpose of the Study:

  • To investigate postnatal changes in the biorbital angle in normal Japanese children.
  • To correlate biorbital angle development with common pediatric eye conditions.

Main Methods:

  • Axial imaging of the orbit in the transverse plane was performed on 129 healthy Japanese infants and children (ages ranging from a few months to 11 years).
  • The biorbital angle was measured as the opening angle between the lateral walls of the orbits.

Main Results:

  • The mean biorbital angle was significantly larger in infants less than one year old (105.0°±6.0°) compared to older children (ranging from 90.9°±3.1° to 97.7°±3.1°).
  • A statistically significant difference was observed between infants under one year and those over one year (P<0.01).

Conclusions:

  • The biorbital angle decreases with age during childhood.
  • A larger biorbital angle in infants may be a contributing factor to the transient exotropia observed in newborns, which often resolves by 2-4 months of age.
Abstract

Keywords:
computed tomographyexotropiainfantmagnetic resonance imagingorbit

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