title: [The Autocad system for planimetric study of the optic disc in glaucoma: technique and reproducibility study].
abstract: OBJECTIVE
  To develop a lens planimetry technique for the optic disc using AutoCAD. To determine variability magnitude of the optic disc morphological measurements.
  
  
  METHODS
  We employed AutoCAD R.14.0 Autodesk: image acquisition, contour delimitation by multiple lines fitting or ellipse adjustment, image sectorialization and measurements quantification (optic disc and excavation, vertical diameters, optic disc area, excavation area, neuroretinal sector area and Beta atrophy area). Intraimage or operator and interimage o total reproducibility was studied by coefficient of variability (CV) (n=10) in normal and myopic optic discs.
  
  
  RESULTS
  This technique allows to obtain optic disc measurement in 5 to 10 minutes time. Total or interimage variability of measurements introduced by one observer presents CV range from 1.18-4.42. Operator or intraimage measurement presents CV range from 0.30-4.21. Optic disc contour delimitation by ellipse adjustment achieved better reproducibility results than multiple lines adjustment in all measurements.
  
  
  CONCLUSIONS
  Computer assisted AutoCAD planimetry is an interactive method to analyse the optic disc, feasible to incorporate to clinical practice. Reproducibility results are comparable to other analyzers in quantification optic disc morphology. Ellipse adjustment improves results in optic disc contours delimitation.
authors.affiliation: Servicio de Oftalmología, Hospital Miguel Servet, INSALUD, Zaragoza.
authors.forename: A
authors.initials: A
authors.lastname: Sánchez Pérez
authors.forename: F M
authors.initials: FM
authors.lastname: Honrubia López
authors.forename: J M
authors.initials: JM
authors.lastname: Larrosa Poves
authors.forename: V
authors.initials: V
authors.lastname: Polo Llorens
authors.forename: B
authors.initials: B
authors.lastname: Melcon Sánchez-Frieras
mesh_terms: D005901:Glaucoma / Q000473:pathology*; D006801:Humans; D009885:Ophthalmology / Q000379:methods; D009898:Optic Disk / Q000473:pathology*; D015203:Reproducibility of Results