title: Value of the Heidelberg Retinal Tomograph in optic nerve hypoplasia.
abstract: OBJECTIVE
  A case of optic nerve hypoplasia (ONH) is reported to demonstrate the value of the Heidelberg Retinal Tomograph II (HRT) in assisting with the diagnosis.
  
  
  METHODS
  An 8-year-old black male was referred to our clinic for evaluation of right esotropia and presumed amblyopia. Best-corrected visual acuities were 20/60 OD (right eye) and 20/25 OS (left eye). Cover test showed constant right esotropia, measuring 10 at distance and 16 at near. A smaller optic nerve head was detected OD with absence of the double ring sign. The findings of HRT were consistent with a diagnosis of unilateral ONH, with a disc area of 1.545 mm OD vs. 2.527 mm OS.
  
  
  CONCLUSIONS
  The clinical features, management, and associations of ONH are discussed.
  
  
  CONCLUSIONS
  HRT is a useful tool to assist in diagnosis of ONH by physically measuring the optic nerve.
authors.affiliation: Illinois College of Optometry, Chicago, IL 60616, USA. ypang@ico.edu <ypang@ico.edu>
authors.forename: Yi
authors.initials: Y
authors.lastname: Pang
authors.forename: Kelly A
authors.initials: KA
authors.lastname: Frantz
mesh_terms: D000550:Amblyopia / Q000175:diagnosis; D002648:Child; D003941:Diagnostic Techniques, Ophthalmological; D004948:Esotropia / Q000175:diagnosis; D005124:Eye Abnormalities / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009898:Optic Disk / Q000002:abnormalities; D009900:Optic Nerve / Q000002:abnormalities*; D014054:Tomography; D014792:Visual Acuity / Q000502:physiology