title: Comparison of cyclodeviation and duction measurement in Graves' orbitopathy patients using different devices.
abstract: OBJECTIVE
  To compare measurement outcomes of different devices measuring cyclodeviation and ductions in Graves' orbitopathy (GO) patients.
  
  
  METHODS
  Cyclodeviation in GO patients was measured using the Harms tangent screen (HTS), the cycloforometer of Franceschetti, and the synoptometer. Ductions were measured using the modified perimeter, the Goldmann perimeter and the Maddox tangent scale (MTS).
  
  
  RESULTS
  In 13 patients, cyclodeviation in primary position, up-, and downgaze was measured with the above-mentioned devices. The mean differences ranged from 0.3º to 3.1º and were smallest between the HTS and the cycloforometer (89% of all measurements within 2º difference). Measurement of abduction, adduction, elevation, and depression using the modified perimeter, Goldmann perimeter, and MTS were obtained in another 13 patients. The mean differences ranged from 1.2º to 12.9º and were smallest between the modified perimeter and the Goldmann perimeter (92% of all measurements ≤ 8º).
  
  
  CONCLUSIONS
  The HTS and cycloforometer produce interchangeable measurement outcomes. The modified perimeter and the Goldmann perimeter are interchangeable as well. However, the synoptometer and the MTS are not suitable for comparative analysis.
authors.affiliation: Department of Ophthalmology, Orthoptic Unit, Academic Medical Center, Amsterdam, The Netherlands. h.m.jellema@amc.uva.nl
authors.forename: Hinke Marijke
authors.initials: HM
authors.lastname: Jellema
authors.forename: Annette
authors.initials: A
authors.lastname: Baader
authors.forename: Susanne
authors.initials: S
authors.lastname: Pitz
authors.forename: Liesbeth
authors.initials: L
authors.lastname: Prick
authors.forename: Wilmar M
authors.initials: WM
authors.lastname: Wiersinga
authors.forename: Maarten Ph
authors.initials: MP
authors.lastname: Mourits
mesh_terms: D000328:Adult; D000368:Aged; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D004867:Equipment Design; D005133:Eye Movements; D005260:Female; D006111:Graves Disease / Q000175:diagnosis* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D058609:Visual Field Tests / Q000295:instrumentation