title: Evaluation of ciliary sulcus diameter using ultrasound biomicroscopy in emmetropic eyes and myopic eyes.
abstract: OBJECTIVE
  To measure the ciliary sulcus-to-sulcus (STS) diameter in 4 axes in emmetropic and myopic eyes using ultrasound biomicroscopy (UBM) and compare the measurements with automated horizontal white-to-white (WTW) diameter measurements.
  
  
  METHODS
  University Eye Hospital Freiburg, Freiburg im Breisgau, Germany.
  
  
  METHODS
  Evaluation of diagnostic technology.
  
  
  METHODS
  The STS diameter was measured at 0, 45, 90, and 135 degrees using 35 MHz UBM. The 0-degree WTW diameters were obtained using scanning-slit topography (Orbscan) and partial coherence interferometry (PCI) biometry (IOLMaster). The 0-degree STS and 90-degree STS were compared using the paired t test; the Pearson correlation was used to assess whether the 0-degree STS diameter could be predicted from the 0-degree WTW diameter.
  
  
  RESULTS
  The mean SE refraction was -0.48 diopter (D) ± 0.35 (SD) in emmetropic eyes and -9.55 ± 3.70 D in myopic eyes. In 35 of 37 eyes, 90-degree STS was greater than 0-degree STS. The mean 90-degree STS was 12.51 ± 0.43 mm. The mean 0-degree STS was 12.19 ± 0.47 mm (P<.01). The mean 0-degree WTW diameters were 11.73 ± 0.37 mm (scanning-slit topography) and 12.20 ± 0.42 mm (PCI biometry). The correlations were good between 0-degree STS and 0-degree WTW with PCI biometry (r(2) = 0.82) and scanning-slit topography (r(2) = 0.86) in emmetropic eyes but weak between 0-degree STS and 0-degree WTW in myopic eyes (r(2) = 0.36 and r(2) = 0.40, respectively).
  
  
  CONCLUSIONS
  Sulcus diameter measurements were most precise using UBM. The ciliary sulcus is vertically oval. The WTW diameter is not suitable for calculating a PC pIOL diameter, particularly in myopic eyes.
authors.affiliation: University Eye Hospital Freiburg, Freiburg im Breisgau, Germany. julia.biermann@uniklinik-freiburg.de
authors.forename: Julia
authors.initials: J
authors.lastname: Biermann
authors.forename: Laura
authors.initials: L
authors.lastname: Bredow
authors.forename: Daniel
authors.initials: D
authors.lastname: Boehringer
authors.forename: Thomas
authors.initials: T
authors.lastname: Reinhard
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D001699:Biometry; D001837:Body Weights and Measures; D002924:Ciliary Body / Q000000981:diagnostic imaging*; D003315:Cornea / Q000000981:diagnostic imaging*; D058453:Emmetropia / Q000502:physiology*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D033401:Microscopy, Acoustic; D008875:Middle Aged; D009216:Myopia / Q000000981:diagnostic imaging* / Q000601:surgery; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D016683:Supine Position; D055815:Young Adult