Variabilidad entre expertos al delimitar el borde y área papilar

  1. Silvia Alayón Miranda
  2. Manuel Antonio González de la Rosa
  3. F.J. Fumero
  4. José Francisco Sigut Saavedra
  5. José Luis Sánchez de la Rosa
Journal:
Archivos de la Sociedad Española de Oftalmologia

ISSN: 0365-6691

Year of publication: 2013

Volume: 88

Issue: 5

Pages: 168-173

Type: Article

Export: RIS
DOI: 10.1016/j.oftal.2012.07.008 DIALNET GOOGLE SCHOLAR

Abstract

Objective: Estimation of the error rate in the subjective determination of the optic nerve head edge and area. Method: 1) 169 images of optic nerve disc were evaluated by five experts for the defining of the edges in 8 positions (every 45°). 2) The estimated areas of 26 cases were compared with the measurements of the Cirrus Optical Coherence Tomography (OCT-Cirrus). Results: 1) The mean variation of the estimated radius was ±5.2%, with no significant differences between sectors. Specific differences were found between the 5 experts (P <.001), each one compared with the others. 2) The disc area measured by the OCT-Cirros was 1.78 mm² (SD =0.27). The results corresponding to the experts who detected smaller areas were better correlated to the area detected by the OCT-Cirrus (r=0.77-0.88) than the results corresponding to larger areas (r =0.61-0.69) (P <.05 in extreme cases). Conclusions: There are specific patterns in each expert for defining the disc edges and involve 20% variation in the estimation of the optic nerve area. The experts who detected smaller areass have a higher agreement with the objective method used. A web tool is proposed for self-assessment and training in this task.