title: Sensitivity and specificity of optic disc variables and analysis of a new variable (MP/D) for glaucoma diagnosis with the Glaucoma-Scope.
abstract: OBJECTIVE
  In an attempt to use the quantitative optic disc measurements of the Glaucoma-Scope (OIS Sacramento, CA, USA) to distinguish glaucomatous from normal optic discs, a new variable was investigated, the mean disc corrected for the disc size by dividing by the disc area: MP/D.
  
  
  METHODS
  Glaucoma-Scope disc evaluation was performed on 81 eyes of 51 patients split into the following groups based on Humphrey 24-2 visual field and clinical criteria of glaucoma: chronic glaucoma n = 27 (including only early, n = 17, and low tension glaucoma, n = 10), ocular hypertension n = 24, pseudoglaucomatous large discs, n = 12, and normal eyes, n = 18. Classic optic disc variables (the vertical and horizontal c/d ratios, and the c/d area) were compared with the new MP/D index calculating receiver operating characteristic curves.
  
  
  RESULTS
  The MP/D ratio was able to identify the glaucomatous eyes more easily than other ratios. Areas under the curves were: 0.91 (MP/D); 0.87 (c/d area); 0.85 (c/d vertical); and 0.80 (c/d horizontal). The MP/D index was also correlated with the mean deviation (r = 0.466; p = 0.001).
  
  
  CONCLUSIONS
  MP/D may prove useful in detecting glaucomatous optic nerve damage and could be an interesting screening tool for primary open angle glaucoma.
authors.affiliation: Glaucoma Institute, Saint Joseph Hospital Foundation, Paris, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Lachkar
authors.forename: H
authors.initials: H
authors.lastname: Cohn
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D016022:Case-Control Studies; D005901:Glaucoma / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D008875:Middle Aged; D009885:Ophthalmology / Q000379:methods; D009898:Optic Disk / Q000473:pathology*; D012372:ROC Curve; D012680:Sensitivity and Specificity