title: Interocular symmetry in myopic anisometropia.
abstract: OBJECTIVE
  To investigate the interocular symmetry of optical, biometric, and biomechanical characteristics between the fellow eyes of myopic anisometropes.
  
  
  METHODS
  Thirty-four young, healthy myopic anisometropic adults (≥ 1 D spherical equivalent difference between eyes) without amblyopia or strabismus were recruited. A range of biometric and optical parameters were measured in both eyes of each subject including axial length, ocular aberrations, intraocular pressure, corneal topography, and biomechanics. Ocular sighting dominance was also measured.
  
  
  RESULTS
  Mean absolute spherical equivalent anisometropia was 1.70 ± 0.74 D, and there was a strong correlation between the degree of anisometropia and the interocular difference in axial length (r = 0.81, p < 0.001). The more and less myopic eyes displayed a high degree of interocular symmetry for the majority of biometric, biomechanical, and optical parameters measured. When the level of anisometropia exceeded 1.75 D, the more myopic eye was more likely to be the dominant sighting eye than for lower levels of anisometropia (p = 0.002). Subjects with greater levels of anisometropia (>1.75 D) also showed high levels of correlation between the dominant and non-dominant eyes in their biometric, biomechanical, and optical characteristics.
  
  
  CONCLUSIONS
  Although significantly different in axial length, anisometropic eyes display a high degree of interocular symmetry for a range of anterior eye biometrics and optical parameters. For higher levels of anisometropia, the more myopic eye tends to be the dominant sighting eye.
authors.affiliation: Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia. sj.vincent@qut.edu.au
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Vincent
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Collins
authors.forename: Scott A
authors.initials: SA
authors.lastname: Read
authors.forename: Leo G
authors.initials: LG
authors.lastname: Carney
authors.forename: Maurice K H
authors.initials: MK
authors.lastname: Yap
mesh_terms: D000293:Adolescent; D000328:Adult; D015858:Anisometropia / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D001696:Biomechanical Phenomena; D003315:Cornea / Q000473:pathology* / Q000503:physiopathology; D019781:Corneal Topography; D023882:Dominance, Ocular / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D009216:Myopia / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D012029:Refraction, Ocular; D014792:Visual Acuity; D055815:Young Adult