title: Axial length measurement and asteroid hyalosis.
abstract: OBJECTIVE
  To evaluate the effect of asteroid hyalosis on automated and manual A-scan axial length measurements.
  
  
  METHODS
  Celal Bayar University School of Medicine, Manisa, Turkey.
  
  
  METHODS
  A case-control study comprised 15 patients with unilateral asteroid hyalosis. The uninvolved eyes were used as controls. Axial length measurements by manual and automated A-scan biometry were performed in both eyes. The main outcome measures were comparisons between manual and automated measurements in asteroid hyalosis eyes with those in control eyes and the assessment of density of asteroid bodies on B-scan photographs.
  
  
  RESULTS
  Statistical analysis revealed no significant difference between axial lengths of asteroid hyalosis eyes and those in control eyes with automated (P = .524) or manual (P = .163) methods. Using automated biometry, 1 patient (7%) had a false (6.23 mm) short axial length measurement in the eye with asteroid hyalosis. There were no significant correlations between manual versus automated measurement differences and the density of the asteroid bodies.
  
  
  CONCLUSIONS
  The axial length of the eye without asteroid hyalosis can be used to calculate intraocular lens power if the patient has no history of clinical anisometropia.
authors.affiliation: Department of Ophthalmology, Celal Bayar University School of Medicine, Manisa, Turkey.
authors.forename: E F
authors.initials: EF
authors.lastname: Erkin
authors.forename: S
authors.initials: S
authors.lastname: Tarhan
authors.forename: F
authors.initials: F
authors.lastname: Oztürk
mesh_terms: D000328:Adult; D000368:Aged; D000886:Anthropometry; D002114:Calcinosis / Q000473:pathology*; D016022:Case-Control Studies; D003941:Diagnostic Techniques, Ophthalmological; D005123:Eye / Q000473:pathology*; D005128:Eye Diseases / Q000473:pathology*; D005260:Female; D006801:Humans; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D014822:Vitreous Body / Q000473:pathology*