title: Ciliary sulcus diameters at different anterior chamber depths in highly myopic eyes.
abstract: OBJECTIVE
  To determine the correlation between white-to-white (WTW) diameters and horizontal ciliary sulcus diameters at different anterior chamber depths (ACDs) in highly myopic eyes.
  
  
  METHODS
  First Affiliated Hospital of Anhui Medical University, Hefei, China.
  
  
  METHODS
  Cross-sectional observational study.
  
  
  METHODS
  Highly myopic eyes were divided into a shallow ACD group (2.8 to 3.2 mm), medium ACD group (3.2 to 3.4 mm), and deep ACD group (>3.4 mm). Ciliary sulcus diameters were measured by full-scale 50 MHz ultrasound biomicroscopy.
  
  
  RESULTS
  In the shallow ACD group, linear regression showed that horizontal sulcus diameters were a significant predictor of WTW diameters (P<.001). The difference between them was greater than 0.50 mm in 13.1% of eyes. In the medium ACD group, linear regression showed horizontal sulcus diameters were a significant predictor of WTW diameters (P<.001). The difference between them was greater than 0.50 mm in 25.7% of eyes and greater than 1.0 mm in 2.8% of eyes. In the deep ACD group, linear regression did not show that horizontal sulcus diameters were a significant predictor of WTW diameters (P=.126). The difference between them was greater than 0.50 mm in 31.6% of eyes and greater than 1.0 mm in 5.3% of eyes. In all eyes, vertical diameters were greater than horizontal diameters.
  
  
  CONCLUSIONS
  The WTW technique was inaccurate at predicting the horizontal diameter of the ciliary sulcus, and predictive errors increased with increasing ACDs. The posterior chambers were not perfectly circular, with vertical diameters being greater than horizontal diameters.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: Department of Ophthalmology, First Affiliated Hospital of Anhui Medical University, Hefei, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Gao
authors.forename: Rong-Feng
authors.initials: RF
authors.lastname: Liao
authors.forename: Ning
authors.initials: N
authors.lastname: Li
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D002924:Ciliary Body / Q000000981:diagnostic imaging*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D033401:Microscopy, Acoustic; D047728:Myopia, Degenerative / Q000000981:diagnostic imaging* / Q000601:surgery; D054120:Phakic Intraocular Lenses; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult