title: Relationship between cantho-limbal distance and degree of head turn in a Korean population.
abstract: OBJECTIVE
  To evaluate the relationship between cantho-limbal distance and the degree of head turn in Koreans.
  
  
  METHODS
  Prospective cross-sectional study.
  
  
  METHODS
  Thirty patients without strabismus or nystagmus who had visited an ophthalmic clinic at a single medical center were included in the study.
  
  
  METHODS
  The distance between the lateral canthus and lateral corneal limbus was measured using a 5 mm scale. The degree of head turn was measured with a goniometer when the cantho-limbal distances were 0, 5, and 10 mm. The degree of head turn was measured 3 times, and the mean value was used as the degree of head turn.
  
  
  RESULTS
  When the cantho-limbal distances were 0, 5, and 10 mm, the degree of head turn values were 42.33, 30.47, and 2.53 degrees, respectively. The shorter the cantho-limbal distance, the higher the degree of head turn (r = -0.945, p < 0.01). The relationship was expressed as: Degree of head turn = -2.98 × cantho-limbal distance + 35.07.
  
  
  CONCLUSIONS
  Cantho-limbal distance can be used to estimate the degree of head turn. This method may be simpler and easier in a clinical situation than checking the degree of head turn with a goniometer.
authors.affiliation: Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea.
authors.forename: Jaemoon
authors.initials: J
authors.lastname: Ahn
authors.affiliation: Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea. Electronic address: ansaneye@hanmail.net.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D053587:Arthrometry, Articular / Q000379:methods*; D044466:Asian People; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005143:Eyelids / Q000033:anatomy & histology*; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D016850:Limbus Corneae / Q000033:anatomy & histology*; D008875:Middle Aged; D011187:Posture; D011446:Prospective Studies; D016059:Range of Motion, Articular / Q000502:physiology; D056910:Republic of Korea