Comparison between GDx VCC parameter and achromatic perimetry in glaucoma patients.

Purpose To evaluate the correlation between polarimetry parameters and standard threshold perimetry indices. Patient and Methods One hundred and eight consecutive glaucomatous patients were recruited in this study. Glaucomatous patients were classified when an abnormal visual field and/or an abnormal optic nerve head were present. One eye was chosen randomly from all the subjects. All optic nerve heads were examined with the GDx variable corneal compensator (VCC) (Laser Diagnostic Technologies, Inc, San Diego, CA) and visual fields were assessed by Humphrey Perimeter, program 24-2, SITA standard (Humphrey Instrument, Inc, San Leandro, CA). GDx VCC parameters and visual field indices were considered. Correlation coefficient was used to compare the 2 sets of data. A linear regression model was also used to calculate the independent contribution of each GDx VCC parameter and to determine which parameter was the most predictive of visual field damage. Results The mean age (±standard deviation) was 61±10.3, the average of the mean deviation (MD) was −2.31±3.2 dB and the mean pattern standard deviation (PSD) was 3.32±2.83 dB. Significant (P Conclusions Some of the GDx VCC indices were significantly correlated to visual field indices in glaucomatous patients, but NFI was the best indicator of visual field damage.