Gdx-vcc Vs Gdx-ecc In Glaucoma Diagnosis

Purpose to compare results provided by scanning laser polarimetry variable corneal compensation (VCC) vs enhanced corneal compensation (ECC) and evaluate correlation to visual field results in glaucoma patients Methods 339 eyes of 182 patients were included and screened by the glaucoma unit of the University Eye Clinic of Pavia (Italy). Patients were submitted to complete ophthalmic examination, standard automated perimetry (SAP), scanning laser polarimetry with GDx-VCC and GDx-ECC. Quality image (Q), typical scan score (TSS), nerve fibers index (NFI), nerve fibers layer average thickness in a band around the optic nerve head (TSNIT average) and in the upper (TSNIT sup) and lower sector (TSNIT inf) were evaluated for each exam. Q, TSS and morphometric parameters provided by VCC and ECC were compared using Wilcoxon signed-rank test and Lin concordance coefficient. Correlation between GDx and perimetric global indexes and was evaluated with Pearson correlation index Results 204 images out of 339 (60%) were of good quality (Q>7) with VCC and 325 out of 339 (96%) with ECC. 140 images out of 339 (41%) were atypical (TSS